JS simple hash function

hash.js

var hash = function(s) {
    /* Simple hash function. */
    var a = 1, c = 0, h, o;
    if (s) {
        a = 0;
        /*jshint plusplus:false bitwise:false*/
        for (h = s.length - 1; h >= 0; h--) {
            o = s.charCodeAt(h);
            a = (a<<6&268435455) + o + (o<<14);
            c = a & 266338304;
            a = c!==0?a^c>>21:a;
        }
    }
    return String(a);
};

@bryc - super explanation, thank you

Going with the 32-bit hash for now but will change to the 53-bit version if we experience frequent collisions.

A comprehensive list of general purpose hash functions and their implementations can found here:

https://www.partow.net/programming/hashfunctions/index.html