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array in groups
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| 1.9.3p194 :001 > a = 1,2,3,4,5,6,6 | |
| => [1, 2, 3, 4, 5, 6, 6] | |
| 1.9.3p194 :002 > a.methods.grep /groups/ | |
| => [:in_groups_of, :in_groups] | |
| 1.9.3p194 :003 > a.in_groups(2) | |
| => [[1, 2, 3, 4], [5, 6, 6, nil]] | |
| 1.9.3p194 :004 > a.in_groups_of(2) | |
| => [[1, 2], [3, 4], [5, 6], [6, nil]] |
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