KeyTake¶ $ wo 'KeyTake[<|a -> 1, b -> 2, c -> 3|>, {a, c}]' <|a -> 1, c -> 3|> The operator form KeyTake[keys] applies to an association later. $ wo 'KeyTake[{a, c}][<|a -> 1, b -> 2, c -> 3|>]' <|a -> 1, c -> 3|>