ruby-on-rails - ruby实现像php的array_count_values一样的功能

Question

请问如何用ruby实现像php的array_count_values一样的功能，请尽量Rubiful。

Answer 1

# ruby 2.4
[1,2,1,1,3,4].group_by(&:itself).transform_values(&:count)

Answer 2

names = ["Jason", "Jason", "Teresa", "Judah", "Michelle", "Judah", "Judah", "Allison"]

names.inject(Hash.new(0)) { |total, e| total[e] += 1 ;total}