amyhenning

"use strict";

var _ = {
	join: (array, separator = ',') => {
		var newString = array.toString();
		if (separator) {
			var replaced = newString.replace(",", separator);
		}
		console.log(replaced);
	}

amyhenning

module Luhn
	def self.is_valid?(number)
		# split the number into an array of its individual digits
		numbers = number.to_s.split('').map { |x| x.to_i }
		# set the index value for the starting number to be the second to last digit in numbers
		digit_to_double = numbers.length - 2

		# until digit_to_double reaches the end of the array
		while digit_to_double >= 0
			# double the number with an index of digit_to_double

amyhenning

class LinkedListNode
	attr_accessor :value, :next_node

	def initialize(value, next_node=nil)
		@value = value
		@next_node = next_node
	end
end

def print_values(list_node)