@hackage / plur

Plurality monad: Zero, one, or at least two.

Latest0.2.0.0

About

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  • Last updated , by joelb
  • License BSD-3-Clause

  • Maintained by: joelburget@gmail.com

  • Lottery factor: 0

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Installation

Tested Compilers

  1. 8.6.3

Readme

Often when counting you don't need an exact count, but only whether there are two things. Two examples:

When searching for inhabitants of a type (implementations of a program), you want to be able to tell whether there are (a) no possible inhabitants, (b) a unique inhabitant, or (c) multiple inhabitants.

When displaying the name of a variable, if there's exactly one variable of a given name ("a") you can just use that name, but if there are multiples you might use a unique id to disambiguate them ("a1" vs "a2").