SOURCE

var mult = function(){
			
			var a = 1;
			for(var i=0,l = arguments.length;i<l;i++){
				a = a*arguments[i]
			}
				return a;
		}

		var proxyMult = (function(){
			var cache = [];
			return function(){
				var args = Array.prototype.join.call(arguments,',');
				if(args in cache){
					// console.error(cache)
					return cache[ args ]
				}
				// console.error(cache)
				return cache[ args ] = mult.apply(this,arguments)
			}
		})();

		console.log(proxyMult(1,2,3,4))

		console.log(proxyMult(1,2,3,4))
		console.log(proxyMult(3,2,1,5))
		console.log(proxyMult(3,2,1,5))
		console.log(mult(2,3,4))
		console.log(mult(5,9,14))