rails opposite of except code example

Example 1: rails excep

hash = { a: true, b: false, c: nil }
hash.except(:c)     # => { a: true, b: false }
hash.except(:a, :b) # => { c: nil }
hash                # => { a: true, b: false, c: nil }

params_to_remove_array = [ :b, :c ]
params.except(*params_to_remove_array) # => { a: true }

Example 2: ruby omit key

hash.except(:key)