PureScript is an open source programming language created in 2013 by Phil Freeman.
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git clone https://github.com/purescript/purescript
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A stronglytyped language that compiles to JavaScript
import Prelude
import Effect.Console (log)
greet :: String > String
greet name = "Hello, " <> name <> "!"
main = log (greet "World")
module Main where
import Debug.Trace
main = trace "Hello World"
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
Feature  Supported  Token  Example 

Strings  âœ“  "  "Hello world" 
MultiLine Comments  âœ“  { }  { A comment } 
Line Comments  âœ“     A comment 
Semantic Indentation  âœ“   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 

Doc comments  âœ“   https://github.com/purescript/documentation/blob/master/language/Syntax.md   `bool` performs case analysis for the `Boolean` data type, like an `if` statement. bool :: forall a. Boolean > a > a > a bool true x _ = x bool false _ x = x 

Comments  âœ“ 
title  date  score  comments 

Show HN: PureScript  a functional language which compiles to Javascript  10/31/2013  2  0 