KeySortBy

KeySortBy[assoc,f] sorts the elements of an association in the order defined by applying f to each of their keys.

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

Examples

Sort by string length of keys:

KeySortBy[<|"abc" -> 1, "a" -> 2, "ab" -> 3|>, StringLength]
(* <|"a" -> 2, "ab" -> 3, "abc" -> 1|> *)

Use operator form:

KeySortBy[StringLength][<|"long" -> 1, "x" -> 2|>]
(* <|"x" -> 2, "long" -> 1|> *)

Please visit the official Wolfram Language Reference for more details.