HashMap.js

function HashMap() { this.data = []; }

HashMap.prototype.hash = function (val) {
    var i = 0;
    var d = ('' + val).split('');
    var l = d.length;
    var t = 0;
    while(i < l) {
        t += d[i].charCodeAt();
        i++;
    }
    return t;
}

HashMap.prototype.add = function (key, val) {
    if (this.data[this.hash(key)] == null) this.data[this.hash(key)] = [key, val];
    else this.data[this.hash(key)].push(key, val);
}

HashMap.prototype.get = function (key) {
    var hash = this.hash(key);
    if (this.data[hash] == null) return null;
    var list = this.data[hash];
    var i = 0;
    var l = list.length;
    while (i < l) {
        if (list[i] === key) {
            return list[i + 1];
        }
        i += 2;
    }
}