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ir-norn/itself.rb

Created September 27, 2015 14:37
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itself.rb
nums = [1,2,3,4,5,1,2,2,3]
p nums.itself { |s| s.inject(:+) / s.size.to_f } # => 2.5555555555555554
p nums.inject(:+) / nums.size.to_f # => 2.5555555555555554
p nums.group_by(&:itself) # => {1=>[1, 1], 2=>[2, 2, 2], 3=>[3, 3], 4=>[4], 5=>[5]}
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