Ruby inner flatten (array of arrays)

Question

I have an array like the following

[
  [[0, :a], [2, :b]],
  [3, :c],
  [4, :d],
  [[5, :e], [6, :f], [7, :g]]
]

That is, an Array of elements

Answer 1

One way to do is:

array.flatten.each_slice(2).to_a

Answer 2

Posting another solution here for posterity:

array.flat_map{|el| el.first.is_a?(Array) ? el : [el]}

This solution also handles if the innermost Arrays are of variable length -- that is, the total Array is an Array of (1) n-element Arrays or (2) Arrays of n-element Arrays, where n is not necessarily the same for any given element. For example

[
  [1,2,3],
  [[4,5], [6,7,8,9]]
]