bool-extras: A fold function for Bool

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.

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• bool-extras-0.2.0.tar.gz [browse] (Cabal source package)
• Package description (revised from the package)

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Package maintainers

• TomLokhorst

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Candidates

• 0.4.0