Memoization Or caching data without global variable in Javascript.

factorial.js

fact = (function(){
	var memo = {};
	function clousre(n){
		console.log(n);
		if (n == 0 || n == 1)
			return 1;
		if (n in memo)
        	return memo[n];
		memo[n] = n * clousre(n - 1);
		return memo[n];
    }
	return clousre;
})();