The bool-extras package
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The bool function allows folding over boolean values.
This is comparable to the maybe or either functions on their respective types.
The bool function is a replacement for the build-in if then else-syntax. However, since it is a function, it can be partially applied and passed around to higher order functions, like so:
ghci> :m + Data.Bool.Extras ghci> let yesOrNo = bool "no" "yes" ghci> map yesOrNo [True, False, True] ["yes", "no", "yes"]
Note that the arguments to bool are in the opposite order of the if then else-syntax; First the false value, then the true value, and finally the boolean.
|Versions||0.2.0, 0.3.0, 0.4.0, 0.4.0|
|Change log||None available|
|Dependencies||base (>=3 && <5) [details]|
|Author||Erik Hesselink, Jeroen Leeuwestein, Tom Lokhorst, Sebastiaan Visser|
|Maintainer||Tom Lokhorst <email@example.com>|
|Uploaded||Fri Apr 4 12:58:22 UTC 2014 by TomLokhorst|
- bool-extras-0.4.0.tar.gz [browse] (Cabal source package)
- Package description (included in the package)
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