Enumerable#tally in Ruby 2.7

Ruby 2.7 adds Enumerable#tally method for counting the same items in a collection. Before that i.e. Enumerable#each_with_object had to be used:

elements = [1, 2, 3, 4, 1, 2, 4, 2, 3]
elements.each_with_object(Hash.new(0)) { |e, h| h[e] += 1 }

=> {1=>2, 2=>3, 3=>2, 4=>2}

With a new tally method, it’s much easier:

elements.tally

=> {1=>2, 2=>3, 3=>2, 4=>2}