Simple Javascript For Loop

Question

Hey guys, i need to know if my thought process is correct for this for loop:

function f(n) {
var res=1;
for(var i=2; i<= n ;i++){
res*=i;
}
return res;
}

document.write(f(4));

The result of f(4) is 24 and i thought it in this way:

i = 2
2 <= 4 Yes
res*=i -> res = res * i -> res = 1 * 2 = 2

i = 3 (because we increment i)
3 <=4 Yes
res*=i -> res = res * i -> res = 1 * 3 = 3

i = 4
4 <= 4 Yes
res*=i -> res = res * i -> res = 1 * 4 = 4

This is where the loop stop because the next time i=5 is not <= of 4

Now we have 3 different res result (2, 3 and 4)
So for get the 24 final result you just multiply them like this 2*3*4 = 24?
Is this the correct process?

Answer 1

Not exactly:

i = 2
2 <= 4 Yes
res*=i -> res = res * i -> res = 1 * 2 = 2

Yes, but next, res now equals to 2:

i = 3 (because we increment i)
3 <=4 Yes
res*=i -> res = res * i -> res = 2 * 3 = 6

... and by same way:

i = 4
4 <= 4 Yes
res*=i -> res = res * i -> res = 6 * 4 = 24

This is where the loop stop because the next time i=5 is not <= of 4

Next is wrong:

Now we have 3 different res result (2, 3 and 4)
So for get the 24 final result you just multiply them like this 2*3*4 = 24?
Is this the correct process?

So you're near, but not ;)
I hope I've been clear ^^

Answer 2

Oh damn i've not considered that the res value get updated on every cicle :-/
Thx visph