A method to flatten an array of integers

array_flatten.rb

def array_flatten(array, result = [])
  array.each do |element|
    if element.is_a? Integer
      result.push element
    else
      array_flatten(element, result)
    end
  end
  result
end


result = array_flatten([[1,11,[20,21]],2,3,[4,5,6],7,[9,10,[45,78]]])
puts result.inspect