Split array up into n-groups of m size?

Question

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Need to split arrays to sub arrays of specified size in Ruby

I'm looking to take an array---say [0,5,3,8,21,7,2] for example---and produce an array of arrays, split every so many places. If the above array were set to a, then

a.split_every(3)

would return [[0,5,3],[8,21,7][2]]

Does this exist, or do I have to implement it myself?

Use `Array#in_groups_of`. https://apidock.com/rails/Array/in_groups_of — Bater Chen, Jul 07 '22 at 04:52

score 132 · Accepted Answer · answered Oct 26 '11 at 18:51

132

Use Enumerable#each_slice.

a.each_slice(3).to_a

Or, to iterate (and not bother with keeping the array):

a.each_slice(3) do |x,y,z|
  p [x,y,z]
end

answered Oct 26 '11 at 18:51

Platinum Azure

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Full credit to http://stackoverflow.com/questions/3864139/need-to-split-arrays-to-sub-arrays-of-specified-size-in-ruby, which taught me something new today :-) – Platinum Azure Oct 26 '11 at 18:52

score 22 · Answer 2 · answered Oct 26 '11 at 18:52

22

a = (1..6).to_a
a.each_slice(2).to_a # => [[1, 2], [3, 4], [5, 6]]
a.each_slice(3).to_a # => [[1, 2, 3], [4, 5, 6]]
a.each_slice(4).to_a # => [[1, 2, 3, 4], [5, 6]]

answered Oct 26 '11 at 18:52

maerics

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Split array up into n-groups of m size?

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