Get Credit Card Brand

getCreditCardBrand.js

/* 
   DISCLAIMER: This code is part of pagarme.js
   Reference - https://github.com/pagarme/pagarme-js/blob/master/dist/pagarme.js
*/

var getCreditCardBrand = function(cardNumber) {
	if(!cardNumber) {
		return null;
	}

	var cardNumber = cardNumber.replace(/[^0-9]/g, '');

	var cardStartRules = [
		['elo', 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		['discover', ['6011', '622', '64', '65']],
		['diners', ['301', '305', '36', '38']],
		['amex', ['34', '37']],
		['aura', ['50']],
		['jcb', ['35']],
		['hipercard', ['38', '60']],
		['visa', ['4']],
		['mastercard', ['5']]
	];

	for (var i = 0; i < cardStartRules.length; i++) {
		var cardStartRule = cardStartRules[i][1];
		for (var j = 0; j < cardStartRule.length; j++) {
			var start = cardStartRule[j];
			if (cardNumber.substring(0, start.length) == start) {
				return cardStartRules[i][0];
			}
		}
	}

	return 'unknown';
};