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  1. module Enumerable
  2.   def map_select
  3.     reduce([]) { |accumulator, value|
  4.       new_value = yield value
  5.       accumulator << new_value if new_value
  6.       accumulator
  7.     } 	  	
  8.   end
  9. end
  10.  
  11. p (1..10).map_select { |v| v.even? && v * 2 }
Success #stdin #stdout 0.05s 9608KB
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Standard input is empty
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[4, 8, 12, 16, 20]
https://ideone.com/gRbU5w
language:
Ruby (ruby 2.5.5)
created:
8 years ago
visibility:
public

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