SortBy

SortBy[list, f] sorts the elements of list in the order defined by applying f to each of them.

Examples

Sort by length:

SortBy[{"apple", "pie", "banana"}, StringLength]
(* {"pie", "apple", "banana"} *)

Sort by absolute value:

SortBy[{3, -1, 2, -5, 4}, Abs]
(* {-1, 2, 3, 4, -5} *)

Please visit the official Wolfram Language Reference for more details.