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vlas-ilya/isValidCreditCard

Created October 9, 2015 15:22
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isValidCreditCard
var isValidCreditCard = function (xs) {
return xs.split('').reverse().map(function (elem, index, xs) {
return index % 2 ? (2 * elem < 9 ? 2 * elem : 2 * elem - 9) : Number(elem);
}).reduce(function(sum, elem) { return sum + elem }) % 10 == 0;
}
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