altheia-async-data-validator/lib/utils/luhn.js

A very simple, fast and customizable async data validator

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
// credit => https://gist.github.com/ShirtlessKirk/2134376
exports.default = ((arr) => {
    return (ccNum) => {
        let len = ccNum.length;
        let bit = 1;
        let sum = 0;
        let val;
        while (len) {
            len -= 1;
            val = parseInt(ccNum.charAt(len), 10);
            // eslint-disable-next-line no-bitwise
            bit ^= 1;
            sum += bit ? arr[val] : val;
        }
        return sum && sum % 10 === 0;
    };
})([0, 2, 4, 6, 8, 1, 3, 5, 7, 9]);