mootools creditcard class

CreditCard.js

this.CreditCard = new Class({
    implements: [Options, Events],
    options: {
        //credit cards you accept
        CARDS: [
            {
                Visa: /^4([0-9]){12}(?:[0-9]{3})?$/
            },
            {
                MasterCard: /^5[1-5][0-9]{14}$/
            },
            {
                Discover: /^6(?:011|5[0-9]{2})[0-9]{12}$/
            },
            {
                AmericanExpress: /^3[47][0-9]{13}$/
            },
            {
                DinersClub: /^3(?:0[0-5]|[68][0-9])[0-9]{11}$/
            },
            {
                JCB: /^(?:2131|1800|35\d{3})\d{11}$/
            },
            {
                Maestro: /^((67\d{2})|(4\d{3})|(5[1-6]\d{2})|(6011))-?\d{4}-?\d{4}-?\d{4}|3[4,7]\d{13}$/
            }
        ],
        ut: "Unknown Type",
        testCards: [
            "4929000000006",    // visa cc
            "5404000000000001", // mc
            "4462000000000003", // visa delta/debit
            "5641820000000005", // maestro
            "4917300000000008"  // electron
        ]
    },

    initialize: function(number) {
        //if not number then return false
        if (!number) {
            return false;
        }
        //the given number is automatically stripped of whitespace/
        this.number = number.replace(/\s/g, '').trim();

        //for every card from CARDS create a boolean
        //method to tell us is exists that type or not
        this.options.CARDS.each(function(obj, index) {
            this._addHandler(index);
        }, this);
    },

    isValid: function() {
        return this._verifyLuhn();
    },

    _verifyLuhn: function() {
        var number = this.number;
        var sum = 0,
            alt = false,
            i = number.length - 1,
            num;
        if (number.length < 13 || number.length > 19) {
            return false;
        } //end if
        while (i >= 0) {

            //get the next digit
            num = parseInt(number.charAt(i), 10);

            //if it`s not a valid number then abort
            if (isNaN(num)) {
                return false;
            }

            //if it`s an alternate number then double
            if (alt) {
                num *= 2;
                if (num > 9) {
                    num = (num % 10) + 1;
                } //endif
            } //end if
            //flip the alternate bit
            alt = !alt;

            //add to the rest of the sum
            sum += num;

            //go to the next digit
            i--;

        } //end while
        return (sum % 10 == 0);
    },

    getType: function() {
        //first, test whether the card is valid
        //if valid then
        if (this._verifyLuhn()) {
            //loop through the object this.options.CARDS
            var cardType = false;

            this.options.CARDS.some(function(obj) {
                //if one of them then return the card
                var card = Object.keys(obj)[0];

                if (this['is' + card]()) {
                    // save card type
                    cardType = card;
                    // exit loop
                    return true;
                }
            }, this);

            // return type found or unknwn type
            return cardType || this.options.ut;
            //otherwise the card isn't valid
        } else {
            return "The card is not valid!";
        }
    },

    _addHandler: function(index) {
        var obj = this.options.CARDS[index], card = Object.keys(obj)[0], cardRegEx = Object.values(obj)[0];
        return this['is' + card] = function() {
            return cardRegEx.test(this.number);
        };
    }
}); //end class CreditCard