JavaScript Memoization

memoize.js

function memoize(fn) {
    return function() {
        var args = Array.prototype.slice.call(arguments),
            hash = "",
            i = args.length;
        currentArg = null;
        while (i--) {
            currentArg = args[i];
            hash += (currentArg === Object(currentArg)) ?
                JSON.stringify(currentArg) : currentArg;
            fn.memoize || (fn.memoize = {});
        }
        return (hash in fn.memoize) ?
            fn.memoize[hash] : fn.memoize[hash] = fn.apply(this, args);
    };
}