Why is my if statement not taken into account inside this function?

Question

https://code.sololearn.com/W2VV2NEzWsg4/?ref=app

Answer 1

Your 'if' statement works, so if user input zero, you document.write('1'), but you also write the returned value of your factorial function ^^
Change your code by adding the 'else' keyword before the call to your factorial function:

if (nu===0){
document.write(1);

}
else document.write(fac(nu));

[edit]
Another way is to test the 0 case inside your factorial function ;)

Answer 2

delete this
if (nu===0){
document.write(1);

}
and run this
document.write(nu===0?1:fac(nu));