Created
October 30, 2012 02:43
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| 1.9.3p125 :001 > [1,2,3,4,5,6,7,8].map { |n| n if n %2 == 0 } | |
| => [nil, 2, nil, 4, nil, 6, nil, 8] | |
| 1.9.3p125 :002 > [1,2,3,4,5,6,7,8].select { |n| n %2 == 0 } | |
| => [2, 4, 6, 8] |
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