covard/ruby_array_group.md

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Ruby array group / count same value to hash

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ruby_array_group.md

Array Group By Same Value

2.7.1 :001 > [1, 2, 3, 4, 5, 6, 6, 5, 7, 8, 9, 0].group_by(&:itself).map { |k, v| [k, v.count] }.to_h
=> {1=>1, 2=>1, 3=>1, 4=>1, 5=>2, 6=>2, 7=>1, 8=>1, 9=>1, 0=>1}