planet-mitchell-0.1.0: Planet Mitchell

Safe HaskellSafe
LanguageHaskell2010

Maybe.Partial

Synopsis

Documentation

fromJust :: Maybe a -> a #

The fromJust function extracts the element out of a Just and throws an error if its argument is Nothing.

Examples

Expand

Basic usage:

>>> fromJust (Just 1)
1
>>> 2 * (fromJust (Just 10))
20
>>> 2 * (fromJust Nothing)
*** Exception: Maybe.fromJust: Nothing