Created
January 20, 2014 05:22
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| a = [1, 2, 3, 4, 5] | |
| a.collect { |n| next if n % 2 == 1; n * 2 }.compact # => [4, 8] | |
| a.select { |n| n % 2 == 0 }.map { |n| n * 2 } # => [4, 8] |
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