Is there an opposite function of slice function in Ruby?

Question

In this post, slice function is used to get only necessary elements of params. What would be the function I should use to exclude an element of params (such as user_id)?

Answer 1

Inspired in the sourcecode of except in Rails' ActiveSupport

You can do the same without requiring active_support/core_ext/hash/except

    # h.slice( * h.keys - [k1, k2...] )

    # Example:
    h = { a: 1, b: 2, c: 3, d: 4 }
    h.slice( * h.keys - [:b, :c] ) # => { a: 1, d: 4}