How to remove multiple keys from a map?

Your remove-key function is covered by the standard library function dissoc. dissoc will remove more than one key at a time, but it wants the keys to be given directly in the argument list rather than in a list. So you can use apply to “flatten” it out.

(apply dissoc {:foo 1, :bar 2, :baz 3} [:foo :bar])
==> {:baz 3}