Why JavaScript shows "undefined" alert in the 1st line of of r() in the below snippet?

Question

please don't share image of your code. – Nihal Apr 24 '18 at 06:08 — Nihal, Apr 24 '18 at 06:08

score 1 · Answer 1 · edited Apr 24 '18 at 07:31

1

You need to remove the var from the b in the r function. You cant set a local variable with the same name as global.

function r() {
    alert(b);
    b = "another stuff";
    alert(b);
    alert(window.b);
}

edited Apr 24 '18 at 07:31

Albert Einstein

answered Apr 24 '18 at 06:18

finnishNinja

*"You cant set a local variable with the same name as global."* How sure are you about that statement? – Robby Cornelissen Apr 24 '18 at 06:20

score 0 · Answer 2 · answered Apr 24 '18 at 06:17

0

Look this: question, point 7. JavaScript always moves variable declarations (not initializations) to the top of the scope.

answered Apr 24 '18 at 06:17

Dizip

2 Answers2