Can we declare below statement in js? This question was asked in interview.

Question

Var undefined ;

Answer 1

A variable can be accessed before it's declaration. This concept is called variable hoisting

Answer 2

Could you please explain me the use of variable hoisting?

Answer 3

Well kid, as a matter of fact, I can. But you can do so yourself. Visit Mozilla Development Network, or just Google it.

Answer 4

Thanks bro.

Answer 5

my pleasure

Answer 6

We can not declare any variable as undefined; example:
var undefined=20;
document.write(undefined);
The output printed will be undefined but not 20; It means the variable declaration is not happening.