Your sample is a bit broken and it took me some time to find out what is broken. The memoized function is not actually returning anthing, so caching is not poss

Your sample is a bit broken and it took me some time to find out what is broken. The memoized function is not actually returning anthing, so caching is not possible. Also it has a side effect (console.log), so the second call won't log. A better sample would be a method with a complicated, expensive calculation. Fixed version: http://goo.gl/fAyqcV http://goo.gl/fAyqcV