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Module: List
Function: sortBy
Type: (a -> a -> Ordering) -> [a] -> [a]
Description:
Related: group, groupBy, inits, intersperse, mapAccumL, mapAccumR, nub, nubBy, partition, sort, tails, transpose

Example 1

Input: sortBy compare [3,2,5,2,1]

Output: [1,2,2,3,5]

Example 2
Program source: 

xxx a b  | odd a = LT
         | otherwise = GT

Input: sortBy xxx [1,2,3,4,5,6,7]

Output: [1,3,5,7,6,4,2]