Hash Slicing
Rails' ActiveSupport adds
#slice and
#slice!
to the Hash class. The interface of these two methods seems a little
inconsistent though.
> {a: 1, b: 2, c: 3}.slice(:a)
=> {:a=>1}
The #slice method returns what is being sliced.
> {a: 1, b: 2, c: 3}.slice!(:a)
=> {:b=>2, :c=>3}
The #slice! method, on the other hand, returns what is being excluded.