Form validation question

Question

So I just want to be clear here, so it's not possible to write multiple "if" statements like in this code, or is there a way to manipulate it?
https://code.sololearn.com/WJGjUpqbUCuX/?ref=app

Answer 1

my approach to this will be first put required attribute to field that should not be blank.
by doing so you dont need to check if they are empty

https://code.sololearn.com/WieiQzw3D5Y4/?ref=app

Answer 2

I have tried it as this.

https://code.sololearn.com/W5kz3Ly4F6p7/?ref=app

Answer 3

You can do this btw
if (n1.value != '' && n2.value != '' && n1.value == n2.value)
But it's better to follow Tastes approach