bool-extras: A fold function for Bool

[ bsd3, data, library ] [ Propose Tags ]

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 [faq] 0.2.0, 0.3.0, 0.4.0
Dependencies base (<4.7) [details]
License BSD-3-Clause
Author Erik Hesselink, Jeroen Leeuwestein, Tom Lokhorst, Sebastiaan Visser
Maintainer Tom Lokhorst <tom@lokhorst.eu>
Revised Revision 1 made by HerbertValerioRiedel at 2018-10-01T17:54:08Z
Category Data
Uploaded by TomLokhorst at 2009-05-13T08:24:59Z
Distributions Debian:0.4.0, NixOS:0.4.0
Downloads 3711 total (9 in the last 30 days)
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