ava/docs/revision2.md

Ava R2

This document specifies the second revision of the Ava programming language, started 2024-07-18.

Example

• TODO: Disambiguate fn with and without implementation.

fn not: Boolean -> Boolean
    λ false => true
    λ true => false
end fn

given A
given B
class Eq
    fn eq: A -> B -> Boolean

    fn neq: A -> B -> Boolean
        λ x y => not (eq x y)
    end fn

    infix =: A -> B -> Boolean
        λ x y => eq x y
    end infix

    infix !=: A -> B -> Boolean
        λ x y => neq x y
    end infix
end class

given F *
class Functor
    --- Transform some wrapped data from one type to another, preserving the
    --- wrapper.
    ---
    --- @tparam A The type of input data.
    --- @tparam B The type of output data.
    given A
    given B
    fn map: F A -> (A -> B) -> F B
end class

given A
class Semigroup
    fn combine: A -> A -> A
end class

given A :: Semigroup
class Monoid
    fn empty: A
end class

fn silly_string: String -> Int32
    λ "foo" => 1
    λ "bar" => 2
    λ baz =>
        -- No reason to do this, but demonstrates the syntax.
        baz match
            case "baz" => 3
            case _ => 4
        end match
end fn