Less contrived pattern matching II

PatternMatching2.md

Less Contrived Pattern Matching Example II

Another example of a nice use of pattern matching I came upon while practicing basic hs- pattern match over a tuple of two booleans that you're creating ad hoc. This is great because it avoids the nesting of ifs/ternaries and is more clear what's going on.

getClassification :: Int -> Int -> Classification
getClassification target aliquotSum =
  case (target > aliquotSum, target < aliquotSum) of
    (True, _) -> Deficient
    (_, True) -> Abundant
    _ -> Perfect

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In javascript we might write it thusly:

const getClassification = (target, aliquotSum) => 
  return target > 'aliquotSum' 
      ? 'Deficient'
      : target < aliuotSum 
      ? 'Abundant' 
      : 'Perfect'

or in python:

def getClassification(target, aliquotSum):
  if (target > aliquotSum):
    return 'Deficient'
  if (target < aliquotSum):
    return 'Abundant'
  return 'Perfect'

first example here