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arempe93/luhns.js

Created February 22, 2016 20:26
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Javascript credit card validator using Luhn's Algorithm
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luhns.js
function isValidCreditCard(number) {
var len = number.length,
multiply = 1,
sum = 0,
val;
while (len--) {
val = parseInt(number.charAt(len), 10);
sum += (multiply ^= 1) ? Math.trunc(val * 2 / 10) + (val * 2 % 10) : val;
}
return sum && sum % 10 == 0;
}
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https://jsfiddle.net/ccwz1q4s/

~4.3 million ops/sec - http://jsperf.com/cc-validator

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