Maximum call stack size exceeded -> Basic Algorithm Scripting: Factorialize a Number

I am working on the Basic Algorithm Scripting: Factorialize a Number exercise. My code is:

function factorialize(num) {
  if (num == 1) {
    return 1;
  }
  else {
    return num * factorialize(num-1);
  }
}

factorialize(5);

however this does not work and gives the error

Maximum call stack size exceeded

I tried my code in another Jac=vaScript IDE and it worked fine and gave the correct answer so is there any reason why this wouldn’t work in FCC?

Your function does not deal with the case of num equal to 0. You create an infinite recursion because the final exit condition of num == 1 is never satisfied, so the else code block executes indefinitely.