>>> insertBy cmpS (S "ccc") $ fromListBy cmpS [S "a" , S "bb" , S "dddd"] fromList [S "a",S "bb",S "ccc",S "dddd"]When trying to insert an element that equals an element already in the set (according to the given comparator), this function replaces the old element by the new one:
>>> insertBy cmpS (S "cc") $ fromListBy cmpS [S "a" , S "bb" , S "dddd"] fromList [S "a",S "cc",S "dddd"]running time: <math>