got confused with JSChallange, decrement in WhileLoop

Question

i got this question where

var a;
var b = 0;

a = 20;
a = --a;

while(a > a--){
b++;
}

document.write(b);

the result that i got is 0, why? is the 'b' not being processed by the while loop? or its just a trap question?

Or is it because a>a-- is 19 > 19 which is returned false so that the looping do not runing thus the 'b' is back to the first value?

Am I clear enough to describe my question? I'm afraid you don't understand with what I'm trying to ask

Answer 1

I would assume it's because 19 == 19. Since it's a post decrement, the variable 'a' won't be affected until after, so you got it. It just won't trigger the while loop

Answer 2

oh ok i understand now, tysm for your explanation

Answer 3

Slick

so its true that the WHILE looping do not asign the b++ to the 'b' because the condition that the WHILE meet is 'false' And the value of 'b' is still 0.

Answer 4

Yeah, check this one

https://code.sololearn.com/WyJd9J0D78Ct/?ref=app