MaximalBy

MaximalBy[data, f] returns a list of the elements e_i of data for which the value of f[e_i] is maximal.

MaximalBy[data, f, n] returns a list of the elements corresponding to the n largest f[e_i].

MaximalBy[f] represents an operator form of MaximalBy that can be applied to an expression.

Examples

Find maximal elements:

MaximalBy[{1, -2, 3, -4}, Abs]
(* {-4} *)

Find elements with longest length:

MaximalBy[{"a", "bb", "ccc", "dd"}, StringLength]
(* {"ccc"} *)

Please visit the official Wolfram Language Reference for more details.