Ruby 2.5 added Hash#slice method

Let's say we have a hash { id: 1, name: 'Ruby 2.5', description: 'BigBinary Blog' } and we want to select key value pairs having the keys name and description.

We can use the Hash#select method.

irb> blog = { id: 1, name: 'Ruby 2.5', description: 'BigBinary Blog' }
  => {:id=>1, :name=>"Ruby 2.5", :description=>"BigBinary Blog"}

irb> blog.select { |key, value| [:name, :description].include?(key) }
  => {:name=>"Ruby 2.5", :description=>"BigBinary Blog"}

Matzbara Masanao proposed a simple method to take care of this problem.

Some of the names proposed were choice and pick.

Matz suggested the name slice since this method is ActiveSupport compatible.

irb> blog = { id: 1, name: 'Ruby 2.5', description: 'BigBinary Blog' }
  => {:id=>1, :name=>"Ruby 2.5", :description=>"BigBinary Blog"}

irb> blog.slice(:name, :description)
  => {:name=>"Ruby 2.5", :description=>"BigBinary Blog"}

So, now we can use a simple method slice to select key value pairs from a hash with specified keys.

Here is the relevant commit and discussion.