purescript-0.5.4.1: examples/passing/Comparisons.purs

module Main where

import Control.Monad.Eff
import Debug.Trace

foreign import data Assert :: !

foreign import assert
  "function assert(x) {\
  \  return function () {\
  \    if (!x) throw new Error('assertion failed');\
  \    return {};\
  \  };\
  \};" :: forall e. Boolean -> Eff (assert :: Assert | e) Unit

main = do
  assert (1 < 2)
  assert (2 == 2)
  assert (3 > 1)
  assert ("a" < "b")
  assert ("a" == "a")
  assert ("z" > "a")
  trace "Done!"