Question

I have an array that is something like this:

arr = [4, 5, 6, 7, 8, 4, 45, 11]

I want a fancy method like

sub_arrays = split (arr, 3)

This should return the following: [[4, 5, 6], [7,8,4], [45,11]]

Note: This question is not a duplicate of "How to chunk an array". The chunk question is asking about processing in batches and this question is about splitting arrays.

Answer 1

arr.each_slice(3).to_a

each_slice returns an Enumerable, so if that’s enough for you, you don’t need to call to_a.

In 1.8.6 you need to do:

require 'enumerator'
arr.enum_for(:each_slice, 3).to_a

If you just need to iterate, you can simply do:

arr.each_slice(3) do |x,y,z|
  puts(x+y+z)
end