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A comment on Destroy All Ifs – A Perspective from Functional Programming. Parent comment

Re:Destroy All Ifs – A Perspective from Functional Programming by titzer on Sunday July 17, 2016 @12:08PM (#12110582)
Use an enum.
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Re:Destroy All Ifs – A Perspective from Functional Programming by eru on Monday July 18, 2016 @06:43AM (#12114264)
No need to stop there. Not only use an enum, but also make it bear different types of values for different cases, and you arrive at Algebraic Datatypes. Eg, for trees you can have:

    data Tree = Empty
              | Leaf Int
              | Node Tree Tree
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