You know that you can collect an array as groups using in_groups or in_groups_of.

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Maybe you want to fetch those values in "columns" where the first value lives in the first column, the second one in the second, etc. until it wraps, so that for example the fourth value is in the first of three columns.

Put the attached file into config/initializers/ to be able to say in_columns on any Array:

>> [1, 2, 3, 4, 5, 6, 7].in_columns(3)
=> [[1, 4, 7], [2, 5], [3, 6]]

>> [1, 2, 3, 4, 5, 6, 7].in_columns(2)
=> [[1, 3, 5, 7], [2, 4, 6]]

While in_groups and in_groups_of are provided by Rails this also works in pure Ruby. If it does not for you, require 'enumerator' Show archive.org snapshot .