Confusion in eloquent javascript power recursion sample

Question

this recursion code is from the book of eloquent javascript

function power(base, exponent) {
  if (exponent == 0) {
    return 1;
  }
  else {
    return base *          


        

Answer 1

What you have to notice is that the power function returns 1 when exponent is 0 and
return base * power() on another case.

Pay attention to power function

In the following code

power(base, exponent - 1);

you have to appreciate some things

1) If exponent is 1 the function power returns 1 so in here

return base * power(base, exponent - 1);

Whether base is 2

return 2 * 1

The function power is returning 2, so in the next step

return base * power(base, exponent - 1);

means

return 2 * 2;

which is 4, that means that function power is returning 4

I think you can catch up from here.

Let me know if you understood :)