CUSIP validator

cusip-validate.js

function cusipValidate(cusip) {
    cusip = cusip.toUpperCase();

    if (!/^[0-9A-Z@#*]{9}$/.test(cusip)) {
        return false;
    }

    var sum = 0,
        cusipChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ*@#".split('');

    var cusipLength = cusip.length - 1;

    for (var i = 0; i < cusipLength; i++) {
        var item = cusip[i];

        var code = item.charCodeAt(0),
            num,
            isChar = (code >= 'A'.charCodeAt(0) && code <= 'Z'.charCodeAt(0));

        if (isChar) {
            num = (cusipChars.indexOf(item) + 10);
        } else {
            num = Number(item);
        }

        if ((i % 2) != 0) {
            num *= 2;
        }

        num = (num % 10) + Math.floor((num / 10));
        sum += num;
    }
    return ((10 - (sum % 10)) % 10) === Number(cusip[cusip.length - 1]);
}

var cusipObjCorrect = {
    "Apple Inc.": "037833100",
    "Cisco Systems": "17275R102",
    "Google": "38259P508",
    "Microsoft": "594918104",
    "Oracle": "68389X105"
};

Object.keys(cusipObjCorrect).map(
    function (key) {
        console.log("Cusip validate " + key + ": " + cusipValidate(cusipObjCorrect[key]));
    }
);

var cusipArrayNonCorrect = [
    "037831200",
    "172712102",
    "3825PD508",
    "5949XD104",
    "68383X105"
];

cusipArrayNonCorrect.map(
    function (item) {
        console.log("Cusip validate not correct: " + cusipValidate(item));
    }
);

This little function works for stock and bond cusuip validation, but not for Put/Call options. All put/call validation fails.

For instance, ACADEMY SPORTS & OUTDOORS (cusip = 00402L107) option's put cusip = 00402L957, call option = 00402L907, this function returns false.