JavaScript ES6 non-secure hash function

hash.es6

let hash = (o) => {
    return padLeft(uneval(o)
        .split('')
        .map((c) => c.charCodeAt(0))
        .reduce((x,y) => {
            let v = ((y<<5)-y)+x;
            return modPow(0xBCD1B799D, v && v, 0x7FFFFFFF);
        })
        .toString(16)
        .toUpperCase(),'0',9);
};