KeyMap

KeyMap[f, <|key1 -> val1, key2 -> val2, ...|>] maps f over the keys in an association, giving <|f[key1] -> val1, f[key2] -> val2, ...|>.

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

Examples

Uppercase keys:

KeyMap[ToUpperCase, <|"a" -> 1, "b" -> 2|>]
(* <|"A" -> 1, "B" -> 2|> *)

Transform numeric keys:

KeyMap[# + 10 &, <|1 -> "one", 2 -> "two"|>]
(* <|11 -> "one", 12 -> "two"|> *)

Operator form:

KeyMap[ToString] @ <|1 -> a, 2 -> b|>

Please visit the official Wolfram Language Reference for more details.