memoize.js

/*
  Simple memoize function for function caching
  - use args array as cache key
  - Usage:
    function fib(n){
        return n < 2? n: fib(n-2) + fib(n-1);
    }
    fib = namespace.memoize(fib);
*/
var namespace = {};
namespace.memoize = function(f){
	return function(){
		var args = Array.prototype.slice.call(arguments), 
		    cache = this.memoizeCache;
		if(!cache) cache = this.memoizeCache = {};
		if(!cache[args]) cache[args] = f.apply(this, arguments);
		return cache[args];
	}
}