flatten in ruby

flatten.rb

## Q-2 Write a method which will flatten an Array?
arr = [1, [2, 3], [4]]

def flatten(arr)
  flatten_arry = []
  arr.each do |item|
  	if item.class == Array
    	flatten_arry += flatten(item)
    else
    	flatten_arry << item
    end
  end
	flatten_arry
end