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PureScript

PureScript

PureScript is a pl created in 2013 by Phil Freeman.

#133on PLDB 9Years Old 10.7kUsers
0Books 0Papers 5kRepos

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A strongly-typed language that compiles to JavaScript


Example from the web:
import Prelude import Effect.Console (log) greet :: String -> String greet name = "Hello, " <> name <> "!" main = log (greet "World")
Example from hello-world:
module Main where import Debug.Trace main = trace "Hello World"
Example from Linguist:
module Control.Arrow where import Data.Tuple class Arrow a where arr :: forall b c. (b -> c) -> a b c first :: forall b c d. a b c -> a (Tuple b d) (Tuple c d) instance arrowFunction :: Arrow (->) where arr f = f first f (Tuple b d) = Tuple (f b) d second :: forall a b c d. (Category a, Arrow a) => a b c -> a (Tuple d b) (Tuple d c) second f = arr swap >>> first f >>> arr swap swap :: forall a b. Tuple a b -> Tuple b a swap (Tuple x y) = Tuple y x infixr 3 *** infixr 3 &&& (***) :: forall a b b' c c'. (Category a, Arrow a) => a b c -> a b' c' -> a (Tuple b b') (Tuple c c') (***) f g = first f >>> second g (&&&) :: forall a b b' c c'. (Category a, Arrow a) => a b c -> a b c' -> a b (Tuple c c') (&&&) f g = arr (\b -> Tuple b b) >>> (f *** g) class ArrowZero a where zeroArrow :: forall b c. a b c infixr 5 <+> class ArrowPlus a where (<+>) :: forall b c. a b c -> a b c -> a b c

Language features

Feature Supported Example Token
Strings
"Hello world"
"
MultiLine Comments
{- A comment
-}
{- -}
Line Comments
-- A comment
--
Semantic Indentation
-- https://github.com/purescript/documentation/blob/master/language/Syntax.md
-- Syntax is whitespace sensitive. The general rule of thumb is that declarations which span multiple lines should be indented past the column on which they were first defined on their subsequent lines.
foo = bar +
 baz
Comments

HackerNews discussions of PureScript

title date score comments
Show HN: PureScript - a functional language which compiles to Javascript 10/30/2013 2 0
simula.html · purescript.html · rdf.html

View source

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