The bool-extras package
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|
|Author||Erik Hesselink, Jeroen Leeuwestein, Tom Lokhorst, Sebastiaan Visser|
|Maintainer||Tom Lokhorst <firstname.lastname@example.org>|
|Uploaded||Wed May 13 08:24:59 UTC 2009 by TomLokhorst|
|Distributions||Debian:0.4.0, NixOS:0.4.0, Stackage:0.4.0|
|Downloads||1388 total (18 in the last 30 days)|
|Status||Docs uploaded by user
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