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As it is generally known in Nigeria that English language is not our first language (L1) but a foreign language, therefore the teaching and learning of English should be strictly adhered to. The writer therefore finds it necessary to examine the progress of electronic media in the teaching of English language in Akure South Local Government Area of Ondo State. The purpose of the study is to find out the effect of electronic media in the teaching of English language as a result of inadequate provision of electronic media. Electronic media play some vital roles in the teaching and learning of English language. Some of these roles are viz; it facilitates learning; it gives room for students and teachers interaction. It develops students in the use of English language; it also leads to success of students academic performance in English language. The writer adopted random sampling technique in each of the schools selected and only the students in the senior secondary school two (SSS2) were used as sample for the project. In each of the SSS II classes in the five schools, 40 students were selected at random from each class consisted of boys and girls. In schools where they have four arms of SSSII, 10 students were randomly selected in each arm. This made a total number of 40 students per school and 200 students in all the five schools. Therefore, two hundred students filled the questionnaires for students while ten teachers from the five selected schools were given the questionnaires.

Title Page                                                                                i
Approval page                                                                                ii
Dedication                                                                                iii
Acknowledgement                                                                             iv-v
Abstract                                                                                vi
Table of content                                                                                vii-viii
1.     Introduction                                                                            1
1.1            Background of the study                                                    1-4
1.2            Statement of the Problem                                                   4-5
1.3            Research Questions                                                            5
1.4            Purpose of the Study                                                                   6-7
1.5            Significance of the Study                                                    7
1.6            Delimitation of the Study                                                   7
2.       Introduction                                                                            8
2.1     Review of Related literature                                                    8
2.2     Electronic Media in Education                                                9-11
2.3     Radio and Television as Instructional Aids                                      11-17
3.       Introduction                                                                            18
3.1     Research Procedure and Methodology                                              18
3.2     Population                                                                               18-19
3.3     Sampling Procedure                                                                19
3.4     Instrument                                                                               20-22
3.5     Validity and Reliability of instrument                                               22
3.6     Administration of Instrument Data Collection                        23
3.7     Method of Data Analysis                                                        23-24
4.       Introduction                                                                            25
4.1     Analysis of Data Result and Discussion                                 25-33
5.       Summary, Conclusion and Recommendation                          34
5.1     Summary                                                                                34-37
5.2     Conclusion                                                                              37-38
5.3     Implication                                                                                38
5.4     Recommendations                                                                             38-40
          References                                                                               41
          Appendix I                                                                              42-43
          Appendix II                                                                                44-45

1.1  Background to the study
    An Effective English Language teacher must serve as a model for his students to imitate. To be a good model, a teacher must be well at home in language skills such as the skills of reading, writing, speaking and listening. A language teacher, especially a second or foreign language teacher skills will eventually pass errors to his listeners, this is because one will give out what one possesses.
     In an attempt to solve this problem of teaching and learning of  English language in Nigerian secondary Schools especially in Akure Local Government Secondary schools, electronic media which refers to the usage of electronic Viz, Radio and Television are suggested in the study as a way of  improving the teaching of  English Language in secondary schools .
     Since English Language is inclusive in the syllabus and even made compulsory for all students, its importance or roles cannot be overemphasized.
The English Language has been a sort of limited lingua-Franca among education people in Nigeria. This can be deduced in one of the write-ups of Adekayero,  (1989) in his book titled (Problems of English Language in West Africa.)
       English Language has acquired the states of an official language in Nigeria .English language has not only bridged the communication gap among different ethnic groups in Nigeria, but also used as a medium of communication among literates of different linguistic ethnic groups. Through the use of English Language, Hausa man could discuss with Yoruba man without any obstruction.
      It is required of all learners to be thoroughly versed in English Language. It should be noted that English language is also an important requirement for award, of certificates and securing admission into higher institutions.
        From the time immemorial, there have been poor performance of students in the subject (English Language) which could be traced back to many factors
  Such as: non- availability aids, inadequacy of professionally trained English Language teachers and non exposure of students to good methods of teaching that could facilitate learning of the language.
        The continuous creation of state in Nigeria has given room to rapid increase in the numbers of television and Radio stations. In view of this, many researches are being carried out in some states in Nigeria to know the Education effect of mass media in our society at large.
This study was carried out to know the extent to which Television and Radio influence the teaching of English Language in Nigeria secondary schools, particularly in Akure Local Government area of Ondo States.
    However, the development of Mass Media, such as television and radio have contributed immensely to the teaching of English language and most of the students spend a greater percentage of their time listening to radio broadcast and watching important and educative programmes on television. these new media were designed to entertain, educate and broaden people’s outlook and offer new ways of learning and self-expression. In essence, the importance of mass media such as television and radio to the teaching of English Language cannot be treated with levity hand since students academic performances are largely dependant on the amount of resources made available for teaching the subject.
1.2     Statement of the Problem.
Education is in era of change, this is because traditional methods of teaching are being questioned and re-examined.the universal surge to education on inspiring challenge. This has led to the invention of many technological media devices and system appeared to offer major contributions to the effectiveness and efficiency of educational institutions. Examples of these innovations are filmstrips slide projector. Programmed learning , opaque, projector, motion projector etc
This study is designed to carry out a research in Akure Local Government Area of Ondo state using radio and television stations so as to find out;
1.       Whether there are similarities between the role in which radio and television played and in other states where a similar research have been         carried out.
2.       Whether there are adequate instructional materials in schools.
3.       Whether the students learning ability increased with the aid of        electronic media.
4.       Whether if formality is reduced in the atmosphere of learning, learning     can be facilitated.
5.       Whether the students are exposed to new ideas and mysteries.
1.3     Research Questions
 Based on the above stated problem, the following questions were raised:
1.     Are the electronic materials such as radio and television sets in schools?
2.     Do electronic media such as radio and television facilitate learning?
3.     Do the students learn better in the classroom or in a relax atmosphere watching television?
4.     How do teachers of English language make the classroom through the electronic media a place of interpretation of information and creation of reality?
5.     Do the students watch educative programmes?
1.4     The Purpose of the Study
The purpose of this study was to find out the extent to which television and radio facilitated the teaching of English language in the senior secondary schools in Akure South Local Government Area of Ondo State.
According to Mcknown (1968), radio and television are affective in stimulating a mental activity because usually at least they are interesting and relatively easy to master. This means that television and radio programmes should have positive effect on both teaching and learning of English Language since the students who are exposed to the use of such instructional programmes feel freer and learn better because the setting in more like on out of school situation in which the atmosphere is formal. Nowadays, the interest being developed towards the use of television and radio programmes is increasing rapidly.
Hence, there is need to examine the impact of the media on education and development. The study, therefore, was intended to find out how teaching and learning of English language could be facilitated through electronic media and it was also set to find out the extent to which they had gone in helping the students in the learning of English language. It would assess the optimistic and pestimistic effect of these media and suggest possible ways of improving it.
1.5     Significance of the Study
It was hoped that the findings of the study would create the necessary awareness for the teacher of English language so that they would see the need to incorporate what the learners learn through television and radio program into the school curriculum to facilitate the student’s interest.
It was hoped that it would enable the media situations to know the effectiveness of their transmission and the students to understand how they could learn English language in a meaningful and positive ways through the conglomeration of visual and sound, and thereby improve on it. It was hoped that the study would be a contribution to knowledge.
1.6     Delimitation of the Study
This study was restricted to selected secondary schools in Akure South Local Government Area of Akure township and the schools were randomly selected to represent all the schools in the whole confined to N.T.A Akure, O.S.R.C, positive F.M. and sunshine F.M all in Ondo State because their transmission is well received in parts of the state.

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Liepaja, Latvia, East Europe Hotels
Karosta Prison - Adventure In A Former Soviet Prison
Karosta Prison
Unchanged since Tsarist Russia, for 100 years this prison served to brutalize those who fell foul of the Tsar and Communist Party. The place is said to be haunted. Perhaps you feel brave enough to take their tour. Just don’t blame your captors… I mean hosts when you see a ...
Accommodation types: Ghost   Hostel   Jail   Soviet
Location: Liepaja  Latvia  East Europe

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UNISON Falkirk Council – Consultative Ballot Terms & Conditions

As the Local Government Pay Ballot Closes, another Opens.

Separate to this year’s Pay Ballot, Falkirk Council UNISON Branch have opened a consultative ballot on terms and conditions cuts. Falkirk initiated consultation with Trade Unions close to two years ago with a stated view of reaching agreement on a modernised package of terms conditions.

Falkirk Council has now concluded that the following terms & conditions, Long Service Awards, Telephone allowance, Relocation expenses, Overnight allowance, Subsistence allowance and Excess travel should be removed. They have also stated that, settlement of elements of the 2018 pay deal which Falkirk Council have yet to implement, is conditional upon acceptance of these cuts. UNISON Falkirk understood that the living wage consolidation element of the 2018 pay deal had been agreed without conditions attached. Falkirk Council has now kicked this particular door in by insisting that implementation of a sustainable Scottish Living Wage is only possible with the removal of the above noted conditions. The genie is now out of the bottle and we encourage you to participate in our Ballot. Your UNISON branch and negotiators cannot recommend these proposals to you for the following reasons:

  • We could not in good conscience recommend proposals, which would see employees who are currently subject to these conditions and associated payments, be placed in financial detriment.

  • Additionally, when the modernisation package was first muted, Scotland was not amid a pandemic which has, potential to increase the reliance upon these allowances.

  • Council leadership were not embarking on a radical overhaul of its model of working, which includes; reduction of desk spaces by 50 plus percent as part of their anytime anywhere review (hot desking/home working), reducing their property portfolio and reorganising their entire structure.

  • Falkirk Council cannot be allowed to go back on elements of the 2018 pay deal unchallenged.

Now is not the time to remove these allowances.

Falkirk Council UNISON Branch do not believe it is right to review these or any other conditions in isolation and the cuts should be held in abeyance, until after the ongoing reorganisation discussions, have concluded.

For example, removal of excess travel makes it more likely, that little thought will be given to where staff like you will be asked to work.

Whilst increased homeworking continues to be the new normal, the pandemic has shown there is no willingness on the part of councils, to compensate employees for any increased cost that they would face working from home i.e., utility bills, heating and internet/telephone bills or mileage from home to work.

Removing these allowances opens the door to any time anywhere culture that is funded out of the employee’s own pocket.

UNISON believe that the employer should not be looking to decide on these proposals in isolation, rather they should form part of the ongoing discussion.

Templates PDF.pdf

HOT Desking- What is it and why should you care?

With the move towards reducing office space, Falkirk Council will likely look at implementing a desk sharing process, known as "hot desking".

UNISON nationally, has reservations about the health and safety implications about this approach to working and have produced information for UNISON activists and members which you can view on our Hot Desking information documents below.


text:
Unison language reference

This document is an informal reference for the Unison language meant as an aid for Unison programmers as well as authors of implementations of the language. This isn't meant to be a tutorial or introductory guide to the language; it's more like a dry and unexciting tome you consult when you have questions about some aspect of the language. 🧐

This language reference, like the language it describes, is a work in progress and will be improved over time (GitHub link). Contributions and corrections are welcome!

A note on syntax

Unison is a language in which programs are not text. That is, the source of truth for a program is not its textual representation as source code, but its structured representation as an abstract syntax tree.

This document describes Unison in terms of its default (and currently, only) textual rendering into source code.

Top-level declarations

A top-level declaration can appear at the top level or outermost scope of a Unison file. It can be one of the following forms:

Term declarations

A Unison term declaration (or "term binding") consists of an optional type signature, and a term definition. For example:

timesTwo : Nat -> Nat
timesTwo x = x * 2

The first line in the above is a type signature. The type signature timesTwo : Nat -> Nat declares that the term named timesTwo is a function accepting an argument of type Nat and computes a value of type Nat. The type Nat is the type of 64-bit natural numbers starting from zero. See Unison types for details.

The second line is the term definition. The = sign splits the definition into a left-hand side, which is the term being defined, and the right-hand side, which is the definition of the term.

The general form of a term binding is:

name : Type
name p_1 p_2 … p_n = expression

Type signatures

name : Type is a type signature, where name is the name of the term being defined and Type is a type for that term. The name given in the type signature and the name given in the definition must be the same.

Type signatures are optional. In the absence of a type signature, Unison will automatically infer the type of a term declaration. If a type signature is present, Unison will verify that the term has the type given in the signature.

Term definition

A term definition has the form f p_1 p_2 … p_n = e where f is the name of the term being defined. The parameters p_1 through p_n are the names of parameters, if any (if the term is a function), separated by spaces. The right-hand side of the = sign is any Unison expression.

The names of the parameters as well as the name of the term are bound as local variables in the expression on the right-hand side (also known as the body of the function). When the function is called, the parameter names are bound to any arguments passed in the call. See function application for details on the call semantics of functions.

If the term takes no arguments, the term has the value of the fully evaluated expression on the right-hand side and is not a function.

The expression comprising the right-hand side can refer to the name given to the definition in the left-hand side. In that case, it’s a recursive definition. For example:

sumUpTo : Nat -> Nat
sumUpTo n =
  if n < 2 then n
  else n + sumUpTo (drop n 1)

The above defines a function sumUpTo that recursively sums all the natural numbers less than some number n. As an example, sumUpTo 3 is 1 + 2 + 3, which is 6.

Note: The expression drop n 1 on line 4 above subtracts one from the natural number n. Since the natural numbers are not closed under subtraction (n - 1 is an Int), we use the operation drop which has the convention that drop 0 n = 0 for all natural numbers n. Unison's type system saves us from having to deal with negative numbers here.

Operator definitions

Operator identifiers are valid names for Unison definitions, but the syntax for defining them is slightly different. For example, we could define a binary operator **:

(**) x y = Float.pow x y

Or we could define it using infix notation:

x ** y = Float.pow x y

If we want to give the operator a qualified name, we put the qualifier inside the parentheses:

(MyNamespace.**) x y = Float.pow x y

Or if defining it infix:

x MyNamespace.** y = Float.pow x y

The operator can be applied using either notation, no matter which way it's defined. See function application for details.

User-defined data types

A user-defined data type is introduced with the type keyword. (See Types for an informal description of Unison's type system.)

For example:

type Optional a = None | Some a

The = sign splits the definition into a left-hand side and a right-hand side, much like term definitions.

The left-hand side is the data type being defined. It gives a name for the data type and declares a new type constructor with that name (here it’s named Optional), followed by names for any type arguments (here there is one and it’s called a). These names are bound as type variables in the right-hand side. The right-hand side may also refer to the name given to the type in the left-hand side, in which case it is a recursive type declaration. Note that the fully saturated type construction Optional Nat is a type, whereas Optional by itself is a type constructor, not a type (it requires a type argument in order to construct a type).

The right-hand side consists of zero or more data constructors separated by |. These are data constructors for the type, or ways in which values of the type can be constructed. Each case declares a name for a data constructor (here the data constructors are None and Some), followed by the types of the arguments to the constructor.

When Unison compiles a type definition, it generates a term for each data constructor. Here they are the terms Optional.Some : a -> Optional a, and Optional.None : Optional a. It also generates patterns for matching on data (see Pattern Matching).

Note that these terms and patterns receive qualified names: if the type named x.y.Z has a data constructor C, the generated term and pattern for C will be named x.y.Z.C.

The general form of a type declaration is as follows:

<unique<[<regular-identifier>]?>?> type TypeConstructor p1 p2 … pn
  = DataConstructor_1
  | DataConstructor_2
  | DataConstructor_n

The optional unique keyword introduces a unique type, explained in the next section.

Unique types

A type declaration gives a name to a type, but Unison does not uniquely identify a type by its name. Rather, the hash of a type's definition identifies the type. The hash is based on the structure of the type definition, with all identifiers removed.

For example, Unison considers these type declarations to declare the exact same type, even though they give different names to both the type constructor and the data constructors:

type Optional a = Some a | None

type Maybe a = Just a | Nothing

So a value Some 10 and a value Just 10 are in fact the same value and these two expressions have the same type. Even though one nominally has the type Optional Nat and the other Maybe Nat, Unison understands that as the type #5isltsdct9fhcrvu ##Nat.

This is not always what you want. Sometimes you want to give meaning to a type that is more than just its structure. For example, it might be confusing that these two types are identical:

type Suit = Hearts | Spades | Diamonds | Clubs

type Direction = North | South | East | West

Unison will consider every unary type constructor with four nullary data constructors as identical to these declarations. So Unison will not stop us providing a Direction where a Suit is expected.

The unique keyword solves this problem:

unique type Suit = Hearts | Spades | Diamonds | Clubs

unique type Direction = North | South | East | West

When compiling these declarations, Unison will generate a universally unique identifier for the type and use that identifier when generating the hash for the type. As a result, the type gets a hash that is universally unique.

Record types

In the type declarations discussed above, the arguments to each data constructor are nameless. For example:

type Point = Point Nat Nat

Here, the data type Point has a constructor Point.Point, with two arguments, both of type Nat. The arguments have no name, so they are identified positionally, for example when creating a value of this type, like Point.Point 1 2.

Types with a single data constructor can also be defined in the following style, in which case they are called record types.

type Point = { x : Nat, y : Nat }

This assigns names to each argument of the constructor. The effect of this is to generate some accessor methods, to help get, set, and modify each field.

Point.x        : Point -> Nat
Point.x.modify : (Nat -> Nat) -> Point -> Point
Point.x.set    : Nat -> Point -> Point
Point.y        : Point -> Nat
Point.y.modify : (Nat -> Nat) -> Point -> Point
Point.y.set    : Nat -> Point -> Point

👉 Note that set and modify are returning new, modified copies of the input record - there's no mutation of values in Unison.

There's currently no special syntax for creating or pattern matching on records. That works the same as for regular data types:

p = Point.Point 1 2
px = match p with
       Point.Point x _ -> x

User-defined abilities

A user-defined ability declaration has the following general form:

ability A p_1 p_2 … p_n where
  Request_1 : Type_1
  Request_2 : Type_2
  Request_n : Type_n

This declares an ability type constructor A with type parameters p_1 through p_n, and request constructors Request_1 through Request_n.

See Abilities and Ability Handlers for more on user-defined abilities.

This section describes the syntax and informal semantics of Unison expressions.

Unison's evaluation strategy for expressions is Applicative Order Call-by-Value. See Function application for details.

Basic lexical forms

See the sections on:

Unison identifiers come in two flavors:

  1. Regular identifiers start with an alphabetic unicode character, emoji (which is any unicode character between 1F400 and 1FAFF inclusive), or underscore (_), followed by any number of alphanumeric characters, emoji, or the characters _, !, or '. For example, foo, _bar4, qux', and set! are valid regular identifiers.
  2. Operators consist entirely of the characters !$%^&*-=+<>.~\\/:. For example, +, *, <>, and >>= are valid operators.

Namespace-qualified identifiers

The above describes unqualified identifiers. An identifier can also be qualified. A qualified identifier consists of a qualifier or namespace, followed by a ., followed by either a regular identifier or an operator. The qualifier is one or more regular identifiers separated by .. For example Foo.Bar.baz is a qualified identifier where Foo.Bar is the qualifier.

Absolutely qualified identifiers

Namespace-qualified identifiers described above are relative to a “current” namespace, which the programmer can set (and defaults to the root of the global namespace). To ignore the current namespace, an identifier can have an absolute qualifier. An absolutely qualified name begins with a .. For example, the name .base.List always refers to the name .base.List, regardless of the current namespace, whereas the name base.List will refer to foo.base.List if the current namespace is foo.

Note that operator identifiers may contain the character .. In order for this to not create ambiguity, the rule is as follows:

  1. . by itself is always an operator.
  2. Any other identifier beginning with . is an absolutely qualified identifier.
  3. A . immediately following a namespace is always a namespace separator.
  4. Otherwise a . is treated as part of an operator identifier.

if . is followed by whitespace or another operator character, the . is treated like an operator character. If it's followed by a regular identifier character, it's treated as a namespace separator.

Hash-qualified identifiers

Any identifier, including a namespace-qualified one, can appear hash-qualified. A hash-qualified identifier has the form x#h where x is an identifier and #h is a hash literal. The hash disambiguates names that may refer to more than one thing.

Reserved words

The following names are reserved by Unison and cannot be used as identifiers: =, :, ->, if, then, else, forall, handle, unique, where, use, and, or, true, false, type, ability, alias, let, namespace, cases, match, with.

Name resolution and the environment

During typechecking, Unison substitutes free variables in an expression by looking them up in an environment populated from a codebase of available definitions. A Unison codebase is a database of term and type definitions, indexed by hashes and names.

A name in the environment can refer to either terms or types, or both (a type name can never be confused with a term name).

Suffix-based name resolution

If the list of segments of a name (base.List.map has the segments [base,List,map]) is a suffix of exactly one fully qualified name in the environment, Unison substitutes that name in the expression with a reference to the definition. For example, the fully qualified name .base.List.map could be referenced via base.List.map, List.map as long as no other definitions end in base.List.map or List.map. This reduces the number of imports needed and cuts down on needing to remember the fully qualified names for definitions. ("Was it base.List.map or util.List.map?")

Hash literals in the program are substituted with references to the definitions in the environment whose hashes they match.

If a free term variable in the program cannot be found in the environment and is not the name of another term in scope in the program itself, or if an free variable matches more than one name (it’s ambiguous), Unison tries type-directed name resolution.

Type-directed name resolution

During typechecking, if Unison encounters a free term variable that is not a term name in the environment, Unison attempts type-directed name resolution, which:

  1. Finds term definitions in the environment whose unqualified name is the same as the free variable.
  2. If exactly one of those terms has a type that conforms to the expected type of the variable (the type system has always inferred this type already at this point), perform that substitution and resume typechecking.

If name resolution is unable to find the definition of a name, or is unable to disambiguate an ambiguous name, Unison reports an error.

Blocks and statements

A block is an expression that has the general form:

A block can have zero or more statements, and the value of the whole block is the value of the final expression. A statement is either:

  1. A term definition which defines a term within the scope of the block. The definition is not visible outside this scope, and is bound to a local name. Unlike top-level definitions, a block-level definition does not result in a hash, and cannot be referenced with a hash literal.
  2. A Unison expression. In particular, blocks often contain action expressions, which are expressions evaluated solely for their effects. An action expression has type {A} T for some ability A (see Abilities and Ability Handlers) and some type T.
  3. A use clause.

An example of a block (this evaluates to 16):

x = 4
y = x + 2
f a = a + y
f 10

A number of language constructs introduce blocks. These are detailed in the relevant sections of this reference. Wherever Unison expects an expression, a block can be introduced with the let keyword:

let <block>

Where <block> denotes a block as described above.

The lexical syntax of blocks

The standard syntax expects statements to appear in a line-oriented layout, where whitespace is significant.

The opening keyword (let, if, then, or else, for example) introduces the block, and the position of the first character of the first statement in the block determines the top-left corner of the block. The beginning of each statement in the block must be lined up exactly with the left edge of the block. The first non-whitespace character that appears to the left of that edge (i.e. outdented) ends the block. Certain keywords also end blocks. For example, then ends the block introduced by if.

A statement or expression in a block can continue for more than one line as long as each line of the statement is indented further than the first character of the statement or expression.

For example, these are valid indentations for a block:

  x = 1
  y = 2
  x + y

let x = 1
    y = 2
    x + y

Whereas these are incorrect:

let x = 1
  y = 2
  x + y

let x = 1
     y = 2
       x + y
Syntactic precedence

Keywords that introduce blocks bind more tightly than function application. So f let x is the same as f (let x) and f if b then p else q is the same as f (if b then p else q).

Block keywords bind more tightly than delayed computations syntax. So 'let x is the same as _ -> let x and !if b then p else q is the same as (if b then p else q) ().

Blocks eagerly consume expressions, so if b then p else q + r is the same as if b then p else (q + r).

A literal expression is a basic form of Unison expression. Unison has the following types of literals:

  • A 64-bit unsigned integer of type .base.Nat (which stands for natural number) consists of digits from 0 to 9. The smallest Nat is 0 and the largest is 18446744073709551615.
  • A 64-bit signed integer of type .base.Int consists of a natural number immediately preceded by either + or -. For example, 4 is a Nat, whereas +4 is an Int. The smallest Int is -9223372036854775808 and the largest is +9223372036854775807.
  • A 64-bit floating point number of type .base.Float consists of an optional sign (+/-), followed by two natural numbers separated by .. Floating point literals in Unison are IEEE 754-1985 double-precision numbers. For example 1.6777216 is a valid floating point literal.
  • A text literal of type .base.Text is any sequence of Unicode characters between pairs of ". The escape character is \, so a " can be included in a text literal with the escape sequence \". The full list of escape sequences is given in the Escape Sequences section below. For example, "Hello, World!" is a text literal. A text literal can span multiple lines. Newlines do not terminate text literals, but become part of the literal text.
  • A character literal of type .base.Char consists of a ? character marker followed by a single Unicode character, or a single escape sequence. For example, ?a, ?🔥 or ?\t.
  • There are two Boolean literals: true and false, and they have type Boolean.
  • A hash literal begins with the character #. See the section Hashes for details on the lexical form of hash literals. A hash literal is a reference to a term or type. The type or term that it references must have a definition whose hash digest matches the hash in the literal. The type of a hash literal is the same as the type of its referent. #a0v829 is an example of a hash literal.
  • A literal list has the general form [v1, v2, ... vn] where v1 through vn are expressions. A literal list may be empty. For example, [], [x], and [1,2,3] are list literals. The expressions that form the elements of the list all must have the same type. If that type is T, then the type of the list literal is .base.List T or [T].
  • A function literal or lambda has the form p1 p2 ... pn -> e, where p1 through pn are regular identifiers and e is a Unison expression (the body of the lambda). The variables p1 through pn are local variables in e, and they are bound to any values passed as arguments to the function when it’s called (see the section Function Application for details on call semantics). For example x -> x + 2 is a function literal.
  • A tuple literal has the form (v1,v2, ..., vn) where v1 through vn are expressions. A value (a,b) has type (A,B) if a has type A and b has type B. The expression (a) is the same as the expression a. The nullary tuple () (pronounced “unit”) is of the trivial type (). See tuple types for details on these types and more ways of constructing tuples.

Documentation literals

Documentation blocks have type Doc (documentation is a first-class value in the language).[: starts a documentation block and :] finishes it. For example:

List.take.apiDocs : Doc
List.take.apiDocs = [:
`@List.take n [1,2,3]` returns the first `n` elements of
a list. This is efficient and takes just `O(log n)` operations.

## Example

  @[source]   examples.List.take.ex1
  @[evaluate] examples.List.take.ex1

## Also see

  * The `@List` type
  * The `@[signature] List.drop` function
  * More about finger trees (used to implement `@List`) here: `@docs.fingerTrees`

More specifically, within the block:

  • Links to definitions are done with @List. \@ is used to escape the @ symbol (and \:] to escape the :] sequence).
  • @[signature] List.take expands to the type signature of List.take
  • @[source] List.map expands to the full source of List.map
  • @[include] someOtherDoc, inserts a value someOtherDoc : Doc here.
  • @[evaluate] someDefinition expands to the result of evaluating someDefinition, which must be a pre-existing definition in the codebase (it can't be an arbitrary expression).

When Unison outputs a doc, it word-wraps paragraphs to fit the output width - where a paragraph is taken to be any sequence of non-indented lines. So you can prevent the wrapping, for a given line, by indenting that line relative to the rest of the doc.

Escape sequences

Text literals can include the following escape sequences:

  • \0 = null character
  • \a = alert (bell)
  • \b = backspace
  • \f = form feed
  • \n = new line
  • \r = carriage return
  • \t = horizontal tab
  • \v = vertical tab
  • \s = space
  • \\ = literal \ character
  • \' = literal ' character
  • \" = literal " character

A line comment starts with -- and is followed by any sequence of characters. A line that contains a comment can’t contain anything other than a comment and whitespace. Line comments are currently ignored by Unison.

A line starting with --- and containing no other characters is a fold. Any text below the fold is ignored by Unison.

Unison does not currently support block comments. A comment can span multiple lines by adding -- to the front of each line of the comment.

Type annotations

A type annotation has the form e:T where e is an expression and T is a type. This tells Unison that e should be of type T (or a subtype of type T), and Unison will check whether this is true. It's a type error for the actual type of e to be anything other than a type that conforms to T.

Parenthesized expressions

Any expression can appear in parentheses, and an expression (e) is the same as the expression e. Parentheses can be used to delimit where an expression begins and ends. For example (f : P -> Q) y is an application of the function f of type P -> Q to the argument y. The parentheses are needed to tell Unison that y is an argument to f, not a part of the type annotation expression.

Function application

A function application f a1 a2 an applies the function f to the arguments a1 through an.

The above syntax is valid where f is a regular identifier. If the function name is an operator such as *, then the syntax for application is infix : a1 * a2. Any operator can be used in prefix position by surrounding it in parentheses: (*) a1 a2. Any regular identifier can be used infix by surrounding it in backticks: a1 `f` a2.

All Unison functions are of arity 1. That is, they take exactly one argument. An n-ary function is modeled either as a unary function that returns a further function (a partially applied function) which accepts the rest of the arguments, or as a unary function that accepts a tuple.

Function application associates to the left, so the expression f a b is the same as (f a) b. If f has type T1 -> T2 -> Tn then f a is well typed only if a has type T1. The type of f a is then T2 -> Tn. The type constructor of function types, ->, associates to the right. So T1 -> T2 -> Tn parenthesizes as T1 -> (T2 -> TN).

The evaluation semantics of function application is applicative order Call-by-Value. In the expression f x y, x and y are fully evaluated in left-to-right order, then f is fully evaluated, then x and y are substituted into the body of f, and lastly the body is evaluated.

An exception to the evaluation semantics is Boolean expressions, which have non-strict semantics.

Unison supports proper tail calls so function calls in tail position do not grow the call stack.

Syntactic precedence of operators and prefix function application

All operators and infix function applications currently have the same precedence, and are parsed left-associative. Use parentheses to obtain a different grouping. So for instance:

  • 1 + 3 * 4 is parsed (1 + 3) * 4. You can group it differently using parentheses: 1 + (3 * 4)
  • a + b < c * d is parsed as ((a + b) < c) * d. You can group it differently using parentheses: a + b < (c * d)
  • x `Nat.drop` 1 + 11 is parsed as (x `Nat.drop` 1) + 11.

When your code is printed back to you by Unison, it will be displayed with minimal necessary parentheses, so if Unison's default syntax later supports operator precedence, old definitions written originally with more parentheses will get displayed with only the parentheses currently needed for the current precedence settings.

Prefix function application:

  • Binds more tightly than infix operators. So f x + g y is the same as (f x) + (g y).
  • Binds less tightly than keywords that introduce blocks. So f let x is the same as f (let x) and f if b then p else q is the same as f (if b then p else q)
  • Binds less tightly than ' and ! (see delayed computations), so 'f x y is the same as (_ -> f) x y and !f x y is the same as f () x y.

Boolean expressions

A Boolean expression has type Boolean which has two values, true and false.

Conditional expressions

A conditional expression has the form if c then t else f, where c is an expression of type Boolean, and t and f are expressions of any type, but t and f must have the same type.

Evaluation of conditional expressions is non-strict. The evaluation semantics of if c then t else f are:

  • The condition c is always evaluated.
  • If c evaluates to true, the expression t is evaluated and f remains unevaluated. The whole expression reduces to the value of t.
  • If c evaluates to false, the expression f is evaluated and t remains unevaluated. The whole expression reduces to the value of f.

The keywords if, then, and else each introduce a Block as follows:

Boolean conjunction and disjunction

A Boolean conjunction expression is a Boolean expression of the form a && b where a and b are Boolean expressions. Note that && is not a function, but built-in syntax.

The evaluation semantics of a && b are equivalent to if a then b else false.

A Boolean disjunction expression is a Boolean expression of the form a || b where a and b are Boolean expressions. Note that || is not a function, but built-in syntax.

The evaluation semantics of a || b are equivalent to if a then true else b.

Delayed computations

An expression can appear delayed as 'e, which is the same as _ -> e. If e has type T, then 'e has type forall a. a -> T.

If c is a delayed computation, it can be forced with !c, which is the same as c (). The expression c must conform to a type () -> t for some type t, in which case !c has type t.

Delayed computations are important for writing expressions that require abilities. For example:

use io

program : '{IO} ()
program = 'let
  printLine "What is your name?"
  name = !readLine
  printLine ("Hello, " ++ name)

This example defines a small I/O program. The type {IO} () by itself is not allowed as the type of a top-level definition, since the IO ability must be provided by a handler, see abilities and ability handlers). Instead, program has the type '{IO} () (note the ' indicating a delayed computation). Inside a handler for IO, this computation can be forced with !program.

Inside the program, !readLine has to be forced, as the type of io.readLine is '{IO} Text, a delayed computation which, when forced, reads a line from standard input.

Syntactic precedence

The reserved symbols ' and ! bind more tightly than function application, So 'f x is the same as (_ -> f) x and !x + y is the same as (x ()) + y.

These symbols bind less tightly than keywords that introduce blocks, so 'let x is the same as _ -> let x and !if b then p else q is the same as (if b then p else q) ().

Additional ' and ! combine in the obvious way:

  • ''x is the same as (_ -> (_ -> x)) or (_ _ -> x).
  • !!x is the same as x () ().
  • !'x and '!x are both the same as x.

You can of course use parentheses to precisely control how ' and ! get applied.

Match expressions and pattern matching

A match expression has the general form:

match e with
  pattern_1 -> block_1
  pattern_2 -> block_2
  pattern_n -> block_n

Where e is an expression, called the scrutinee of the match expression, and each case has a pattern to match against the value of the scrutinee and a block to evaluate in case it matches.

The evaluation semantics of match expressions are as follows:

  1. The scrutinee is evaluated.
  2. The first pattern is evaluated and matched against the value of the scrutinee.
  3. If the pattern matches, any variables in the pattern are substituted into the block to the right of its -> (called the match body) and the block is evaluated. If the pattern doesn’t match then the next pattern is tried and so on.

It's possible for Unison to actually evaluate cases in a different order, but such evaluation should always have the same observable behavior as trying the patterns in sequence.

It is an error if none of the patterns match. In this version of Unison, the error occurs at runtime. In a future version, this should be a compile-time error.

Unison provides syntactic sugar for match expressions in which the scrutinee is the sole argument of a lambda expression:

  pattern_1 -> block_1
  pattern_2 -> block_1
  pattern_n -> block_n

-- equivalent to
e -> match e with
  pattern_1 -> block_1
  pattern_2 -> block_1
  pattern_n -> block_n

A pattern has one of the following forms:

Blank patterns

A blank pattern has the form _. It matches any expression without creating a variable binding.

For example:

match 42 with
  _ -> "Always matches"

Literal patterns

A literal pattern is a literal Boolean, Nat, Int, Float, or Text. A literal pattern matches if the scrutinee has that exact value.

For example:

match 2 + 2 with
  4 -> "Matches"
  _ -> "Doesn't match"

Variable patterns

A variable pattern is a regular identifier and matches any expression. The expression that it matches will be bound to that identifier as a variable in the match body.

For example, this expression evaluates to 3:

match 1 + 1 with
  x -> x + 1

An as-pattern has the form v@p where v is a regular identifier and p is a pattern. This pattern matches if p matches, and the variable v will be bound in the body to the value matching p.

For example, this expression evaluates to 3:

match 1 + 1 with
  x@4 -> x * 2
  y@2 -> y + 1
  _   -> 22

Constructor patterns

A constructor pattern has the form C p1 p2 ... pn where C is the name of a data constructor in scope, and p1 through pn are patterns such that n is the arity of C. Note that n may be zero. This pattern matches if the scrutinee reduces to a fully applied invocation of the data constructor C and the patterns p1 through pn match the arguments to the constructor.

For example, this expression uses Some and None, the constructors of the Optional type, to return the 3rd element of the list xs if present or 0 if there was no 3rd element.

match List.at 3 xs with
  None -> 0
  Some x -> x

List patterns

A list pattern matches a List t for some type t and has one of three forms:

  1. head +: tail matches a list with at least one element. The pattern head is matched against the first element of the list and tail is matched against the suffix of the list with the first element removed.
  2. init :+ last matches a list with at least one element. The pattern init is matched against the prefix of the list with the last element removed, and last is matched against the last element of the list.
  3. A literal list pattern has the form [p1, p2, ... pn] where p1 through pn are patterns. The patterns p1 through pn are matched against the elements of the list. This pattern only matches if the length of the scrutinee is the same as the number of elements in the pattern. The pattern [] matches the empty list.
  4. part1 ++ part2 matches a list which composed of the concatenation of part1 and part2. At least one of part1 or part2 must be a pattern with a known list length, otherwise it's unclear where the list is being split. For instance, [x,y] ++ rest is okay as is start ++ [x,y], but just a ++ b is not allowed.

first : [a] -> Optional a
first as = match as with
  h +: _ -> Some h
  [] -> None

last : [a] -> Optional a
last as = match as with
  _ :+ l -> Some l
  [] -> None

exactlyOne : [a] -> Boolean
exactlyOne a = match a with
  [_] -> true
  _   -> false

lastTwo : [a] -> Optional (a,a)
lastTwo a = match a with
  start ++ [a,a2] -> Some (a,a2)
  _ -> None

firstTwo : [a] -> Optional (a,a)
firstTwo a = match a with
  [a,a2] ++ rest -> Some (a,a2)
  _ -> None

Tuple patterns

A tuple pattern has the form (p1, p2, ... pn) where p1 through pn are patterns. The pattern matches if the scrutinee is a tuple of the same arity as the pattern and p1 through pn match against the elements of the tuple. The pattern (p) is the same as the pattern p, and the pattern () matches the literal value () of the trivial type () (both pronounced “unit”).

For example, this expression evaluates to 4:

match (1,2,3) with
  (a,_,c) -> a + c

Ability patterns (or Request patterns)

An ability pattern only appears in an ability handler and has one of two forms (see Abilities and ability handlers for details):

  1. {C p1 p2 ... pn -> k} where C is the name of an ability constructor in scope, and p1 through pn are patterns such that n is the arity of C. Note that n may be zero. This pattern matches if the scrutinee reduces to a fully applied invocation of the ability constructor C and the patterns p1 through pn match the arguments to the constructor. The scrutinee must be of type Request A T for some ability {A} and type T. The variable k will be bound to the continuation of the program. If the scrutinee has type Request A T and C has type X ->{A} Y, then k has type Y -> {A} T.
  2. {p} where p is a pattern. This matches the case where the computation is pure (the value of type Request A T calls none of the constructors of the ability {A}). A pattern match on an Request is not complete unless this case is handled.

See the section on abilities and ability handlers for examples of ability patterns.

Guard patterns

A guard pattern has the form p | g where p is a pattern and g is a Boolean expression that may reference any variables bound in p. The pattern matches if p matches and g evaluates to true.

For example, the following expression evaluates to 6:

match 1 + 2 with
  x | x == 4 -> 0
  x | x + 1 == 4 -> 6
  _ -> 42

A hash in Unison is a 512-bit SHA3 digest of a term or a type's internal structure, excluding all names. The textual representation of a hash is its base32Hex Unicode encoding.

Unison attributes a hash to every term and type declaration, and the hash may be used to unambiguously refer to that term or type in all contexts. As far as Unison is concerned, the hash of a term or type is its true name.

Literal hash references

A term, type, data constructor, or ability constructor may be unambiguously referenced by hash. Literal hash references have the following structure:

  • A term definition has a hash of the form #x where x is the base32Hex encoding of the hash of the term. For example #a0v829.
  • A term or type definition that’s part of a cycle of mutually recursive definitions hashes to the form #x.n where x is the hash of the cycle and n is the term or type’s index in its cycle. A cycle has a canonical order determined by sorting all the members of the cycle by their individual hashes (with the cycle removed).
  • A data constructor hashes to the form #x#c where x is the hash of the data type definition and c is the index of that data constructor in the type definition.
  • A data constructor in a cyclic type definition hashes to the form #x.n#c where #x.n is the hash of the data type and c is the data constructor’s index in the type definition.
  • A built-in reference to a Unison built-in term or type n has a hash of the form ##n. ##Nat is an example of a built-in reference.

Short hashes

A hash literal may use a prefix of the base32Hex encoded SHA3 digest instead of the whole thing. For example the programmer may use a short hash like #r1mtr0 instead of the much longer 104-character representation of the full 512-bit hash. If the short hash is long enough to be unambiguous given the environment, Unison will substitute the full hash at compile time. When rendering code as text, Unison may calculate the minimum disambiguating hash length before rendering a hash.

This section describes informally the structure of types in Unison. See also the section titled User-defined types for detailed information on how to define new data types.

Formally, Unison’s type system is an implementation of the system described by Joshua Dunfield and Neelakantan R. Krishnaswami in their 2013 paper Complete and Easy Bidirectional Typechecking for Higher-Rank Polymorphism.

Unison extends that type system with, pattern matching, scoped type variables, ability types (also known as algebraic effects). See the section on Abilities for details on ability types.

Unison attributes a type to every valid expression. For example:

  • 4 < 5 has type Boolean
  • 42 + 3 has type Nat,
  • "hello" has type Text
  • the list [1,2,3] has type [Nat]
  • the function (x -> x) has type forall a. a -> a

The meanings of these types and more are explained in the sections below.

A full treatise on types is beyond the scope of this document. In short, types help enforce that Unison programs make logical sense. Every expression must be well typed, or Unison will give a compile-time type error. For example:

  • [1,2,3] is well typed, since lists require all elements to be of the same type.
  • 42 + "hello" is not well typed, since the type of + disallows adding numbers and text together.
  • printLine "Hello, World!" is well typed in some contexts and not others. It's a type error for instance to use I/O functions where an IO ability is not provided.

Types are of the following general forms.

Type variables

Type variables are regular identifiers beginning with a lowercase letter. For example a, x0, and foo are valid type variables.

Polymorphic types

A universally quantified or polymorphic type has the form forall v1 v2 vn. t, where t is a type. The type t may involve the variables v1 through vn.

The symbol is an alias for forall.

A type like forall x. F x can be written simply as F x (the forall x is implied) as long as x is free in F x (it is not bound by an outer scope; see Scoped type variables below).

A polymorphic type may be instantiated at any given type. For example, the empty list [] has type forall x. [x]. So it's a type-polymorphic value. Its type can be instantiated at Int, for example, which binds x to Int resulting in [Int] which is also a valid type for the empty list. In fact, we can say that the empty list [] is a value of type [x] for all choices of element type e, hence the type forall x. [x].

Likewise the identity function (x -> x), which simply returns its argument, has a polymorphic type forall t. t -> t. It has type t -> t for all choices of t.

Scoped type variables

Type variables introduced by a type signature for a term remain in scope throughout the definition of that term.

For example in the following snippet, the type annotation temp:x is telling Unison that temp has the type x which is bound in the type signature, so temp and a have the same type.

ex1 : x -> y -> x
ex1 a b =
  -- refers to the type x in the outer scope
  temp : x
  temp = a

To explicitly shadow a type variable in scope, the variable can be reintroduced in the inner scope by a forall binder, as follows:

ex2 : x -> y -> x
ex2 a b =
  -- doesn’t refer to x in outer scope
  id : ∀ x . x -> x
  id v = v
  temp = id 42
  id a

Note that here the type variable x in the type of id gets instantiated to two different types. First id 42 instantiates it to Nat, then id a, instantiates it to the outer scope's type x.

Type constructors

Just as values are built using data constructors, types are built from type constructors. Nullary type constructors like Nat, Int, Float are already types, but other type constructors like List and -> (see built-in type constructors) take type parameters in order to yield types. List is a unary type constructor, so it takes one type (the type of the list elements), and -> is a binary type constructor. List Nat is a type and Nat -> Int is a type.

Kinds of Types

Types are to values as kinds are to type constructors. Unison attributes a kind to every type constructor, which is determined by its number of type parameters and the kinds of those type parameters.

A type must be well kinded, just like an expression must be well typed, and for the same reason. However, there is currently no syntax for kinds and they do not appear in Unison programs (this will certainly change in a future version of Unison).

Unison’s kinds have the following forms:

  • A nullary type constructor or ordinary type has kind Type.
  • A type constructor has kind k1 -> k2 where k1 and k2 are kinds.

For example List, a unary type constructor, has kind Type -> Type as it takes a type and yields a type. A binary type constructor like -> has kind Type -> Type -> Type, as it takes two types (it actually takes a type and yields a partially applied unary type constructor that takes the other type). A type constructor of kind (Type -> Type) -> Type is a higher-order type constructor (it takes a unary type constructor and yields a type).

Type application

A type constructor is applied to a type or another type constructor, depending on its kind, similarly to how functions are applied to arguments at the term level. C T applies the type constructor C to the type T. Type application associates to the left, so the type A B C is the same as the type (A B) C.

Function types

The type X -> Y is a type for functions that take arguments of type X and yield results of type Y. Application of the binary type constructor -> associates to the right, so the type X -> Y -> Z is the same as the type X -> (Y -> Z).

Tuple types

The type (A,B) is a type for binary tuples (pairs) of values, one of type A and another of type B. The type (A,B,C) is a triple, and so on.

The type (A) is the same as the type A and is not considered a tuple.

The nullary tuple type () is the type of the unique value also written () and is pronouced “unit”.

In the standard Unison syntax, tuples of arity 2 and higher are actually of a type Tuple a b for some types a and b. For example, (X,Y) is syntactic shorthand for the type Tuple X (Tuple Y ()).

Tuples are either constructed with the syntactic shorthand (a,b) (see tuple literals) or with the built-in Tuple.Cons data constructor: Tuple.Cons a (Tuple.Cons b ()).

Built-in types

Unison provides the following built-in types:

  • .base.Nat is the type of 64-bit natural numbers, also known as unsigned integers. They range from 0 to 18,446,744,073,709,551,615.
  • .base.Int is the type of 64-bit signed integers. They range from -9,223,372,036,854,775,808 to +9,223,372,036,854,775,807.
  • .base.Float is the type of IEEE 754-1985 double-precision floating point numbers.
  • .base.Boolean is the type of Boolean expressions whose value is true or false.
  • .base.Bytes is the type of arbitrary-length 8-bit byte sequences.
  • .base.Text is the type of arbitrary-length strings of Unicode text.
  • .base.Char is the type of a single Unicode character.
  • The trivial type () (pronounced “unit”) is the type of the nullary tuple. There is a single data constructor of type () and it’s also written ().

See literals for more on how values of some of these types are constructed.

Built-in type constructors

Unison has the following built-in type constructors.

  • (->) is the constructor of function types. A type X -> Y is the type of functions from X to Y.
  • base.Tuple is the constructor of tuple types. See tuple types for details on tuples.
  • .base.List is the constructor of list types. A type List T is the type of arbitrary-length sequences of values of type T. The type [T] is an alias for List T.
  • .base.Request is the constructor of requests for abilities. A type Request A T is the type of values received by ability handlers for the ability A where current continuation requires a value of type T.

User-defined types

New types can be declared as described in detail in the User-defined types section. These include ordinary data types, unique types, and record types. A type declaration introduces a type, a corresponding type constructor, one or more data constructors that (collectively) construct all possible values of the type, and (in the case of record types) accessors for the named arguments of the type's single data constructor.

Abilities and ability handlers

Unison provides a convenient feature called abilities which lets you use the same ordinary Unison syntax for programs that do (asynchronous) I/O, stream processing, exception handling, parsing, distributed computation, and lots more. Unison's system of abilities (often called "algebraic effects" in the literature) is based on the Frank language by Sam Lindley, Conor McBride, and Craig McLaughlin. Unison diverges slightly from the scheme detailed in this paper. In particular:

  • Unison's ability polymorphism is provided by ordinary polymorphic types, and a Unison type with an empty ability set explicitly disallows any abilities. In Frank, the empty ability set implies an ability-polymorphic type.
  • Unison doesn't overload function application syntax to do ability handling; instead it has a separate handle construct for this purpose.

Abilities in function types

The general form for a function type in Unison is I ->{A} O, where I is the input type of the function, O is the output type, and A is the set of ability requirements of the function. More generally, this can be any comma-separated list of types, like I ->{A1,A2,A3} O.

A function type in Unison like A -> B is really syntactic sugar for a type A ->{e} B where e is some set of abilities, possibly empty. A function that definitely requires no abilities has a type like A ->{} B (it has an empty set of abilities).

The typechecking rule for abilities

The general typechecking rule used for abilities is this: calls to functions requiring abilities {A1,A2} must be in a context where at least the abilities {A1,A2} are available, otherwise the typechecker will complain with an ability check failure. Abilities can be made available using a handle block (discussed below) or with a type signature: so for instance, within the body of a function Text ->{IO} Nat, {IO} is available and therefore:

  • We can call a function f : Nat ->{} Nat, since the ability requirements of f are {} which is a subset the available {IO} abilities.
  • We can also call a function g : Text ->{IO} (), since the requirements of g are {IO} which is a subset of the available {IO} abilities.

For functions accepting multiple arguments, it might seem we need a different rule, but the rule is the same: the body of the function can access the abilities attached to the corresponding function type in the signature. Here's an example that won't typecheck, since the function body must be pure according to the signature:

doesNotWork : Text ->{IO} Text ->{} Nat
doesNotWork arg1 arg2 =
  printLine "Does not work!"

However, if we do the IO before returning the pure function, it typechecks just fine:

doesWork : Text ->{IO} Text ->{} Nat
doesWork arg1 =
  printLine "Works great!"
  (arg2 -> 42) -- we return a pure `Text ->{} Nat`

For top-level definitions which aren't contained in a function body, they are required to be pure. For instance, this doesn't typecheck:

msg = printLine "hello"

But if we say msg = '(printLine "Hello") that typechecks fine, since the printLine is now inside a function body whose requirements inferred as {IO} (try it!).

🤓 This restriction on top level definitions needing to be pure might lifted in a future version of Unison.

Ability inference

When inferring ability requirements for f, the ability requirements become the union of all requirements for functions that can be called within the body of the function.

User-defined abilities

A user-defined ability is declared with an ability declaration such as:

ability Store v where
  get : v
  put : v -> ()

This results in a new ability type constructor Store which takes a type argument v. It also create two value-level constructors named get and put. The idea is that get provides the ability to "get" a value of type v from somewhere, and put allows "putting" a value of type v somewhere. Where exactly these values of type v will be kept depends on the handler.

The Store constructors get and put have the following types:

  • get : forall v. {Store v} v
  • put : forall v. v ->{Store v} ()

The type {Store v} means that the computation which results in that type requires a Store v ability and cannot be executed except in the context of an ability handler that provides the ability.

Ability handlers

A constructor {A} T for some ability A and some type T (or a function which uses such a constructor), can only be used in a scope where the ability A is provided. Abilities are provided by handle expressions:

handle e with h

This expression gives e access to abilities handled by the function h. Specifically, if e has type {A} T and h has type Request A T -> R, then handle e with h has type R. The type constructor Request is a special builtin provided by Unison which will pass arguments of type Request A T to a handler for the ability A. Note that h must accept an argument of type Request A T to handle e of type {A} T—ultimately, a type error will result if an ability is required in a scope where it is not provided by an enclosing handle expression.

The examples in the next section should help clarify how ability handlers work.

Pattern matching on ability constructors

Each constructor of an ability corresponds with a pattern that can be used for pattern matching in ability handlers. The general form of such a pattern is:

{A.c p_1 p_2 p_n -> k}

Where A is the name of the ability, c is the name of the constructor, p_1 through p_n are patterns matching the arguments to the constructor, and k is a continuation for the program. If the value matching the pattern has type Request A T and the constructor of that value had type X ->{A} Y, then k has type Y -> {A} T.

The continuation will always be a function accepting the return value of the ability constructor, and the body of this function is the remainder of the handle .. with block immediately following the call to the constructor. See below for an example.

A handler can choose to call the continuation or not, or to call it multiple times. For example, a handler can ignore the continuation in order to handle an ability that aborts the execution of the program:

ability Abort where
  aborting : ()

-- Returns `a` immediately if the program `e` calls `abort`
abortHandler : a -> Request Abort a -> a
abortHandler a = cases
   { Abort.aborting -> _ } -> a
   { x } -> x

p : Nat
p = handle
      x = 4
      x + 2
    with abortHandler 0

The program p evaluates to 0. If we remove the Abort.aborting call, it evaluates to 6.

Note that although the ability constructor is given the signature aborting : (), its actual type is {Abort} ().

The pattern { Abort.aborting -> _ } matches when the Abort.aborting call in p occurs. This pattern ignores its continuation since it will not invoke it (which is how it aborts the program). The continuation at this point is the expression _ -> x + 2.

The pattern { x } matches the case where the computation is pure (makes no further requests for the Abort ability and the continuation is empty). A pattern match on a Request is not complete unless this case is handled.

When a handler calls the continuation, it needs describe how the ability is provided in the continuation of the program, usually with a recursive call, like this:

use .base Request

ability Store v where
  get : v
  put : v -> ()

storeHandler : v -> Request (Store v) a -> a
storeHandler storedValue = cases
  {Store.get -> k} ->
    handle k storedValue with storeHandler storedValue
  {Store.put v -> k} ->
    handle k () with storeHandler v
  {a} -> a

Note that the storeHandler has a with clause that uses storeHandler itself to handle the Requests made by the continuation. So it’s a recursive definition. The initial "stored value" of type v is given to the handler in its argument named storedValue, and the changing value is captured by the fact that different values are passed to each recursive invocation of the handler.

In the pattern for Store.get, the continuation k expects a v, since the return type of get is v. In the pattern for Store.put, the continuation k expects (), which is the return type of put.

It's worth noting that this is a mutual recursion between storeHandler and the various continuations (all named k). This is no cause for concern, as they call each other in tail position and the Unison compiler performs tail call elimination.

An example use of the above handler:

modifyStore : (v -> v) ->{Store v} ()
modifyStore f =
  v = Store.get
  Store.put (f v)

Here, when the handler receives Store.get, the continuation is v -> Store.put (f v). When the handler receives Store.put, the continuation is _ -> ().

Use clauses

A use clause tells Unison to allow identifiers from a given namespace to be used unqualified in the lexical scope where the use clause appears.

In this example, the use .base.List clause allows the definition that follows it to refer to .base.List.take as simply take:

use .base.List

oneTwo = take 2 [1,2,3]

The general form of use clauses is as follows:

use namespace name_1 name_2 .. name_n

Where namespace is the namespace from which we want to use names unqualified, and name_1 through name_n are the names we want to use. If no names are given in the use clause, Unison allows all the names from the namespace to be used unqualified. There's no performance penalty for this, as use clauses are purely a syntactic convenience. When rendering code as text, Unison will insert precise use clauses that mention exactly the names it uses, even if the programmer omitted the list of names.

See the section on identifiers for more on namespaces as well as qualified and unqualified names.


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Airush Lithium

Ideal for the rider that spends countless hours on the water, the Airush Lithium offers premium freeride versatility while remaining predictable and stable in the air. The focus on wingtip and strut layout in conjunction with the Delta Hybrid design ensures the quickest response through the air as well as an instant relaunch. With amazing park power, stability, and ease of use, the Lithium is simply the perfect kite.

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Everyone knows that there is download folder on Windows and Mac computers. All of the downloaded stuff saves in the download folder. But the situation was changed for iOS mobile phones which include any version of iPhone. There is no definite download folder at where the downloaded files can directly place. So, today we will help you to understand the location of “Download Folder” and how to find downloads on iPhone or iPad and manage them easily.

find downloads on iphone

How to Find the Downloaded Files on iPhone or iPad

Your iPhone always puts your downloaded Videos, Songs, Images or Documents on the related apps after checking the downloaded format. It means that it will not always ask you where to save the downloaded file. It will download and save the file in different app location based on the format.

For example, if you are downloading a photo through your web browser on iPhone, the downloaded picture will automatically download and put in photos app on your iPhone. On the other hand, if you are downloading a PDF file, it will ask you to save download and will automatically put it in document app available on your iPhone.

Now you can try to understand how to find downloads on iPhone or iPad. There are different strategies to do so which are discussed in below.

Where to Find Downloads on iPhone and iPad?

Don’t worry about the downloaded stuff as you can easily find it on your iPhone. It is as simple as finding downloads on Android or any Windows/Mac based computer. You can easily understand the mechanism of the positioning of downloading files on your iPhone. Following are the points which can help you to get access to your downloaded files.

1. Check App Download History to Access Saved Files

find downloaded files on iphone

You can check your installed apps for related download history. It will help you to find out the downloaded items through viewing the history.

2. Use iCloud Drive to Save your Files and Find them Later

iphone downloads folder

To get access towards the downloaded files, you can check the built-in apps on your iPhone. You just need to search the specific app and you can see all downloaded files. For example, if you have downloaded a photo and now want to see it. You only need to open your built-in Photos app. There you can find your downloaded object and can do anything with it.

3. Use File Browsing App to Download & Manage Files on iPhone

find downloaded files on ipad

There are various iOS-based software that can help you to get access to your downloaded things in a folder. Such software can help you to view and search for anything of any format as needed. These software’s browse and search the input file name and display all the related results in no time. We recommend you to download the iSaveit app from App Store to manage your downloaded Videos, Images, Documents, MP3, MP4 and other files easily.

4. Use the iOS 11 File Manager App on your iPhone

iphone downloads location

As there is no feature or option is available in the form of “Download Folder” on your iOS device, so there is need of using an app to manage downloads on iPhone. Files manager app can easily manage and preview your downloaded files in a professional way.

5. Find Downloaded PDF Documents on iPhone

where are pdf files stored on iphone

The downloaded PDF documents can be found in the iBooks app. To save a PDF document in iBook you need to open the PDF document on your iPhone or iPad, tap the share button and tap Copy to iBooks. Now the document will be saved in iBooks and you can easily share it with your friends or colleges.

Most manager download apps are paid and have different features which can help finding the downloaded stuff easily and quickly.

Related Articles to Read


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Disciplines is available in a variety of formats: print, digital, and print/digital combo packages. A digital subscription includes access to author bios, the ability to comment, and audio lectio.

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During my life I have usually employed the Psalms as personal devotional prayers. But the Psalms primarily function as the songbook of God’s people. When the community gathers, the members share them.
Psalm 77 breaks into two sections. In the first (verses 1-10) the psalmist seems alone, in distress, and...

God, even in yourself you form a community of three, a Trinity. Help me remember I am not alone. You are with me, as are others. Amen.

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I join many of those who will pray for you as you seek to discern what you are called to be at this moment. May God grant you the courage to fulfill that calling. May we all open our eyes and see the misery, open our ears and hear the cries of God’s people, and, like God through the Lord Jesus Christ, be incarnate amongst them.”

View a growing list of resources for the spiritual work of overcoming racism.


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Volunteer Code of Conduct    Championship Integrity Policy

Welcome Volunteers!

Thank you for your interest in volunteering at the 2021 U.S. Open Championship at Torrey Pines Golf Course. Due to the overwhelming response to our volunteer program, all volunteer committees and the waitlist are currently full.

If you are a registered volunteer for the 2021 U.S. Open Championship, you can access your volunteer profile by logging in using the link at the bottom of the page.

If you are interested in volunteering for the 2022 U.S. Open Championship at The Country Club in Brookline, Mass., please email 2022usopen@usga.org.

Torrey Pines Golf Course will host the 121st U.S. Open Championship from June 14-20, 2021. For any questions, please contact us at 2021usopen@usga.org.

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The State of Wisconsin Department of Administration and the University of Wisconsin System embrace high-performance green building standards and energy conservation for state facilities and operations. 2005 Wisconsin Act 141 requires each agency to develop energy cost reduction plans. Plans must include all system and equipment upgrades that will pay for themselves in energy cost reductions over their useful life. The energy savings performance contracting program provides a process for UW System to effect energy cost reductions in existing buildings and utility systems.
UW-Stevens Point has been working with McKinstry, LLC, an Energy Service Company (ESCO), through the State of Wisconsin Energy Savings Performance Contract program. McKinstry was selected through a competitive bid selection process in 2012. A comprehensive investment grade energy audit was done for 19 buildings on campus to determine projects that would qualify for the program. A final report was co-authored with UW-Stevens Point Facility Services, which went to technical review at the Division of Facilities Development. The Multi-Building Energy Conservation project that was approved by the Building Commission in October 2015 will assist UW-Stevens Point in complying with energy reduction goals.
The total first cost of the project is estimated at $8.9 million after estimated financial incentives are applied (i.e. Focus on Energy). The implementation of the energy conservation measures (ECMs) will result in an anticipated annual energy cost savings of approximately $607,000 with a simple payback of 14.7 to 15.2 years, depending on actual incentives received. This is below the state energy fund simple payback requirement of 16 years or 20-year payback with repayment at a 5.25% bond rate and a 3% inflation rate.

Annual estimated dollar savings:
Electricity: $397,561
Steam costs $188,142
Water costs over $21,102
Annual energy savings will be found in reduced electricity consumption, steam production and water savings. The project will reduce the campus’ greenhouse gas emissions as well.
Annual projected energy savings:
Electricity reduction of 4,229,377 kWh
Steam reduction of 22,833 MMBtu
Carbon emissions reduction of 10,382,596 lbs.
Investment Grade Audit:  McKinstry engineers and development team analyzed the existing conditions of buildings on campus, collecting energy use data and building systems information.  The audit process helps our team develop energy saving solutions best suited for each building and the campus.
Based on the audit the following Energy Conservation Measures (ECMs) will be implemented:
Interior Lighting Upgrade:  Improve energy efficiency and lighting levels by replacing existing older, higher energy use lighting (T8, T12, HID, Compact Fluorescent and ballasts) systems with more energy efficient lighting in several buildings on campus.  New LED lighting and ballasts will be installed in several buildings.
Exterior Lighting Upgrade:  Improve energy efficiency and lighting levels of exterior pole, walkway, exterior wall, flood and parking lot light fixtures with new, higher efficiency LED fixtures.
Controls & Mechanical Upgrade:  Install new direct digital controls (DDC) on existing pneumatically controlled equipment and integrate into the Energy Management System to optimize the heating, ventilation and air conditioning (HVAC) systems to provide a substantial reduction in energy consumption.
Water Conservation:   Upgrade the existing flush valves (rebuilding or replacement) including the install of dual flush handles on toilets.   Sink faucet aerators will have updated flow control devices installed to reduce flow.  These measures will reduce the amount of waste water production as well.
Steam Traps Upgrade:   Replace failed or nonfunctioning steam traps that are allowing steam bypass.  This will help improve the efficiency of the steam plant by replacing failed or leaking traps to ensure complete condensation at each heat transfer device is achieved.
Building Envelope Improvements:   Improve building envelope performance and reduce energy consumption by reducing exterior air infiltration into the conditioned spaces of buildings.  This is achieved by installing new exterior door seals, window caulking, air conditioner covers, and using spray foam to fill gaps in the building envelope.

Dashboard & Metering:   Installing Operator and Green Kiosk Dashboard hosted services to remotely monitor the energy use of several buildings on campus.  The Operator dashboard format will be available to Facilities staff for energy analysis.  The Green Kiosk format will allow physical interactive kiosks to be added at a later date with only the addition of hardware by the University.
Links to Resources:
Information Memorandum on 2005 Wisconsin Act 141:
Department of Administration Sustainability:
Final presentation document from McKinstry, presented to campus December 11, 2014

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©1993- University of Wisconsin-Stevens Point


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stone crusher china specification

1 SetMin Order 12YRS Zhengzhou General Mining Machinery Co Ltd 1000 Contact Supplier introduction of jaw stone crusher price This series of crushers are mainly used for crushing various materials with compression strength less than 320 MPa features features of jaw stone crusher price 1 Firm structure stable performance large capacity even producing granularity... As a leading global manufacturer of crushing equipment, milling equipment,dressing equipment,drying equipment and briquette equipment etc. we offer advanced, rational solutions for any size-reduction requirements, including quarry, aggregate, grinding production and complete plant plan.

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The best rentals from the top sites, all in one place

We believe finding a vacation rental in Brittany should be easy and not take hours of searching and scrolling. We’ve designed VacationRenter from the ground up to help travelers find the perfect rental faster and easier. logoredawning logooutdoorsy logoRVshare logoAnd many more

Where to stay in Brittany

VacationRenter offers 28,705 holiday homes all over Brittany, and we’re confident that you’ll find accommodations that meet both your needs and your budget. Affordable vacation rentals in Brittany start at a nightly rate of $39, with 20% of properties priced under $65 per night. Whether you’re on the hunt for a private apartment near Parc du Thabor or an entire condo close to Parlement de Bretagne, our goal is to help you find exactly what you need. Our website lists a wide selection of properties from top travel companies like Vrbo, HomeAway,, and many more. No matter if you’re traveling on your own, going on a honeymoon to Brittany, or planning a trip for a group of 13, we can match you with a holiday rental that sleeps everyone comfortably. It’s time to make your dreams of travelling to Brittany a reality.

Home-types in Brittany

Brittany has a variety of property types for you to consider when booking a trip. Here are the most popular property types in Brittany:

Points of interests in Brittany

Brittany has several popular points of interest for you to check out when visiting the area. Here are the most popular points of interest in Brittany:


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GStar Jeans W30 L29

  • Sale
  • Regular price £29.00
  • 1 available

Perfectly worn in jeans are a staple of the Vagabonds Grunge Revival collection. Each pair has been hand picked to ensure good quality and condition and feature unique wear and tear giving them an authentic vintage look. Wear with an oversized plaid shirt and your Converse All Stars for true grunge style.

Brand: GStar
Style: Super Low / Bootcut / Zip Fly
Labelled Size: W30 L30 - please refer to the exact measurements below for the best fit
Colour: Blue
Material: 100% Cotton
Circa: 1990's/Y2K

Condition: Very Good Vintage Condition; These jeans are gently worn giving them an authentic aged look. The jeans pictured are the exact pair you will receive. These jeans have no tears, stains or other damage and like all of my vintage clothing listings, this garment has been laundered in eco-friendly laundry detergent and will reach your doorstep carefully wrapped in recyclable packaging ready to wear. Be proud to recycle, reuse & revive!

Actual Measurements:
Waist (doubled): 31" (low rise)
Hips (doubled): 40"
Rise: 7.5"
Inside Leg: 29"
Ankle: 9.5"


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Levi 506 Jeans W33 L34

  • Sale
  • Regular price £39.00
  • 1 available

Perfectly worn in jeans are a staple of the Vagabonds Grunge Revival collection. Each pair has been hand picked to ensure good quality and condition and features unique wear giving them an authentic vintage look. Wear with an oversized plaid shirt and your Converse All Stars for true grunge style.

Brand: Levi Strauss & Co.
Style: 506 / Straight Leg / Zip Fly
Labelled Size: W32 L34 - please refer to the measurements below for the exact fit
Colour: Blue
Material: 100% Cotton
Circa: 1990's/Y2K

Condition: Very Good Vintage Condition; These jeans are well worn giving them an authentic aged look. The jeans pictured are the exact pair you will receive and have no tears, stains or other damage. Please refer to the images provided which show the general condition. This garment has been laundered in eco-friendly laundry detergent and will reach your doorstep carefully wrapped in recyclable packaging ready to wear. Be proud to recycle, reuse & revive!

Actual measurements when laid flat:
Waistband (doubled): 33"
Hips (doubled): 45"
Rise: 10.5"
Inside Leg: 34"
Ankle: 8"


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Home > Rotary Tillers >

H1800 Heavy Duty Rotary Tiller:
73" Path, 10" Working Depth
Suitable for 55-100HP

Valentini H1800 73" Rotary Tiller

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Availability:: Usually Ships in 1 to 4 Weeks
Product Code: H1800_TILLER

  • Valentini Uses Italian Made Gearboxes With the Largest Sumps for Cooler Operation & Longer Life!
  • Side Gear Drive System is in an Oil Bath Gear Box.
  • Skid Shoes for Depth Control is Standard.
  • Scraper Blades on Rotor's 'End Flanges' prevent Material from Wrapping, for Rotor Seal Protection.
  • Rotor's 'End Flanges' also have Straight Blades to ensure Maximum Working Width Tilling!
  • Tool Free Rear Gate Spring Tension Adjustment is Quick & Easy!
  • Parking Stand & Rear Ridge Leveling Plates are Standard.
  • Tiller Includes a 1-3/8", 6 Spline 540RPM, Shear Bolt Protected PTO Shaft!
  • Sample Photos Are Of The H2300 Tiller, But This Listing Is For The H1800 As Stated.
    • Sample Video is Not the 'H' Series Tiller, but the 'U' Series Tiller w/Roller.
  • Clevis Style, Category 2, 3-Point Hitch is Quick Hitch Compatible!
  • 540RPM Gearbox is Suitable for 55 to 100HP, PTO.
  • Tills a 73" Wide Path.
  • Overall width is 81".
  • Working Depth is 10"!
  • Rotor has 8 Flanges and a Total of 42 Blades!
    • 6 Blades per Flange on 6 Center Flanges.
    • 3 Blades per Flange on 2 Outside Flanges, plus the Cutter & Straight Blades noted above!
  • Tiller Weight: 1,416lb's (less PTO Shaft, Pallet/Crating, etc.).
  • Specifications are based on manufacturer provided data & subject to change.


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Register Today for the Live Webinar from Sparta Systems and Valiance Partners

How to Archive Data in Your QMS.

September 13, 11:00am EST

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Does Your Approach Compare to TRUcompare?

Migrations are a complex undertaking and traditional testing approaches often fall short of today’s business and compliance requirements. The ensuing risk can easily result in costly errors. The question is: How sound are your current testing and sampling approaches?


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1235 Highway 3 South

Northfield, MN 55057

Phone: 507-663-1217

Monday-Friday: 7:30 am - 5:00 pm

Saturday - Sunday: Closed

24 Hour Towing Available

Follow Valley Autohaus on Facebook!  Review Valley Autohaus on Yelp!  Follow Valley Autohaus us on Twitter!  Find Valley Autohaus on Google+!

Dueler HTS - Bridgestone Tires

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Dueler HTS

Features and Benefits

Unique unidirectional VRG (Variable Radius Groove) tread pattern for high efficiency water evacuation, reduced risk of hydroplaning and car-like quick steering response.
Phase shifted tread blocks reduce tread noise and improve ride comfort.
Contemporary sport sidewall design for the performance tire look.

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Lekki Shooting: I’m not dead! Lady cries out after seeing her RIP picture on social media
The RIP post on social media

By Arogbonlo Israel

A lady allegedly killed by the Nigerian Army during the shooting that greeted the #ENDSARS protest at Lekki Tollgate, Lagos, said she’s still alive and hearty.

She said the rumours of her death was a purported attack by unscrupulous elements who hid under the End SARS protest to tarnish her image.

Security agents had allegedly shot at #ENDSARS protesters at the Lekki Tollgate on Tuesday, October 20, leading to yet-to-be ascertained number of casualties.

The shooting incident had also attracted national and international outcry, with the Lagos State and Federal governments being urged to unravel the identity of the shooters and who deployed them.

The alleged Lekki Tollgate death victim, Stephen Becky, spoke to our correspondent via telephone call on Tuesday while describing the news of her death as “untrue and unbelievable”.

Becky, who finished from Jireh Educational Centre in 2018, hails from Rivers State where she currently resides with her father and six other siblings.

According to her, she got the news of her death from a friend of her elder sister who screenshot it from a group and sent to her sister’s Direct Message (DM).

“Someone posted my picture that I was among the people that was shot at Lekki Tollgate. I was very sad and angry for someone to use my picture to write RIP (Rest in Peace) when I am still alive.

“Please, I want people to know that I am very much alive, the tension they are giving my parents and siblings is too much,” Becky told Vanguard Community during an exclusive interview.

The Rivers-born said her mother had to travel from the village to check on her when she heard the rumoured news of her death, urging the members of the public to discard the news.

READ ALSO: #ENDSARS: Senate excuses security agencies from budget defence

Vanguard learnt the purported news of Miss Becky’s death was first posted by a Facebook user but later brought down by the latter when confronted by a friend of the former’s sister.

Reacting, Ihuoma Favour, the friend of Becky’s sister described the story as falsehood while narrating how the saga started.

“I went online and saw the post (Becky’s obituary); l’m a member in one Facebook group, so anything posted there, definitely l’m gonna see it unless l’m not online. So, I saw the post because the person attached it with that group. I immediately screenshot the picture and called Becky’s elder sister to confirm.

“So, when I heard her (Becky’s sister) voice, I told her what I saw and also sent it to her. She told me her sister (Becky) was with her and that I should discard the story.

“I chatted the lady that posted the news to discard the rumours of Becky’s death but to my amazement, she (the poster) replied: ‘Ok she survive’. I scolded her but she never replied after then,”

On her relationship with the alleged victim, Favour said; “Becky Stephen is my friend’s junior sister and also my junior in school back then. She’s someone I know so well, she doesn’t have problem and respect people.”

She however, cautioned those spreading rumours of Becky’s death to desist from such act.

“So I see no reason why someone would post such thing about her. They should please stop posting news of her death,” she concluded.

Vanguard News Nigeria

Comments expressed here do not reflect the opinions of vanguard newspapers or any employee thereof.


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Assemble the perfect Easy Rider tricycle yourself

Did you know that at Van Raam we produce all special needs bikes individually to your order, so you can have your own bike made exactly as you want it? In this article you’ll see the features of the Easy Rider in a video, and we’ll show you the many chosen options for this adult tricycle.

Assemble the perfect Easy Rider tricycle yourself
The Easy Rider tricycle with the Silent System electrical pedal support.

Production of a Van Raam bicycle; the many possibilities

At Van Raam, every bicycle is made in the Van Raam factory from a straight pipe to a complete finished product. And to ensure that everyone gets the perfect bike, we can customize all bikes with many options and accessories. Because not one person is the same and everyone has their own wishes. For example, the most popular tricycle for adults, the Easy Rider tricycle, can be assembled entirely according to your own wishes.

Easy Rider tricycle

The Easy Rider tricycle has been designed with a lot of attention to ride comfort. Due to the completely different seating position than a ‘traditional tricycle for adults’, this bike is much easier to handle and the comfortable seat provides very good back support. Because of the modern appearance and the beautiful design, many Easy Rider cyclists are justifiably proud of this sturdy bike.

Features and many chosen options of the Easy Rider

To give an example of the many options and accessories, you can see an Easy Rider tricycle with many different options in the video below. The standard features, such as adjustable steering stem, parking brake, automatic battery lighting, steering limiter and adjustable seat with adjustable strap backrest are also introduced.

Some of the following options on the Easy Rider in addition to the standard features are: one-handed operation, 8-speed, throttle grip, mirror, detachable frame + support leg for the detachable frame, Silent electric motor HT with battery, mechanical disc brakes, stick holder and shopping basket. All these options (and much more) can also be found on the price list. This list can be found on the product page about the Easy Rider, below ‘price/documentation’. You can read more about options and accessories in the article 'Accessories for the Van Raam Easy Rider tricycle'.

Video Easy Rider tricycle for adults

In the product video of the Easy Rider below, you can see all features of this bike.

Assemble the Easy Rider tricycle yourself

Would you like to assemble your own bike and see the price of your perfect Easy Rider tricycle? With the Van Raam bike configurator, you can configure your own tricycle easily. Read more about this in the article ‘The van Raam bike configurator’ or go directly to the configurator.

Van Raam bike configurator
Tricycle Van Raam with E-Bike app
Cycling on the Easy Rider tricycle with the Van Raam E-Bike App.

Additional functionality for bicycles with pedal support

Did you know that there is also a free Van Raam E-Bike app? If you have an electric Van Raam bike, with the official Van Raam electrical system delivered from May 2016, you can connect the bike to your smartphone.

This app, which can be downloaded from the appstores, can be used as a luxury bike computer for Van Raam bikes with pedal support and also contains many other extra features, such as an SOS function and adjusting the pedal assistance yourself while cycling.

Read more about the Van Raam E-Bike app on the special Van Raam E-Bike App page.

More about the E-Bike App
Video on adult tricycle Easy Rider with E-Bike App

Video Easy Rider tricycle and E-Bike App

The Easy Rider tricycle is a seat tricycle for adults and has great and natural handling. If a bicycle has the unique Van Raam pedal support, it is possible to use the Van Raam E-Bike App. In the article 'Video Easy Rider tricycle for adults and E-Bike app' you can read and see in the video how this works.

Video Easy Rider and E-Bike App