s-valid
Version:
Simple validator for strings
31 lines (30 loc) • 971 B
JavaScript
;
exports.__esModule = true;
// ----- generic card validation
// -- 1. input must be a string
// -- 2. input length must be valid
// -- 3. perform check based on number
// ---------------------------------------
function default_1(s) {
// [1] throws here if not a string
s = s.toLowerCase();
// [2] must be valid card length
if (s.length < 13 || s.length > 19) {
return false;
}
// [3] method of testing credit cards from
// http://ajax.aspnetcdn.com/ajax/jquery.validate/1.13.1/jquery.validate.js
var testNumber = 0;
for (var i = s.length - 1, current, currentInteger = 0, even = false; i >= 0; i--) {
current = s.charAt(i);
currentInteger = parseInt(current, 10);
if (even && (currentInteger *= 2) > 9) {
currentInteger -= 9;
}
testNumber += currentInteger;
even = !even;
}
return (testNumber % 10) === 0;
}
exports["default"] = default_1;
;