Ruby's flatten implementation for Array

flatten-spec.rb

require 'rspec' #gem install rspec
require './flatten'

describe 'myflatten' do 
	it 'makes array single dim regardless of nesting' do 
		expect([1,2,3].myflatten).to eq([1,2,3])

		expect([[1,2,3]].myflatten).to eq([1,2,3])
		expect([[[1,2,3]]].myflatten).to eq([1,2,3])
		expect([[1,2, [3]], [[[[[[[[[4]]]]]]]]], [[5, [6]], 7]].myflatten).to eq([1,2,3,4,5,6,7])
	end
end

flatten.rb

class Array

	def myflatten
		newArr = []
		
		self.each do |item|
			if item.is_a?(Array)
				newArr = newArr + item.myflatten
			else
				newArr.push(item)
			end
		end

		newArr
	end

end