factorial of a number

Question

I have the following code but it is not giving perfect result for factorial can u find it out plz

Answer 1

1. Your function doesn't return anything, ever.
2. What do you do when x is 0?
3. Minor point - apart from alert, you don't really do anything with the returned value.

Try this instead, if you will (hover over the text):

if(x==0) return 1;
return x * fact(x-1);

Working example: http://jsbin.com/apuka3/2