var and let strange behavior

Asked Dec 10 '18 at 18:25

Active Dec 10 '18 at 18:25

Viewed 46 times

in the following code if I use 'var' it outputs "undefined" and if I use 'let' it will produce and error "x is not defined"

function foo() {


    function bar() {
       console.log(x);
    }

    bar();

    var x = 14;

}

foo();

can some one explain it why

asked Dec 10 '18 at 18:25

TheEhsanSarshar

And some good read about *hoisting in Javascript* would help – Roko C. Buljan Dec 10 '18 at 18:29
2

Short answer without digging into the language spec is *never use variables before they're declared*. Then you don't have to worry about the differences. – Jared Smith Dec 10 '18 at 18:31

0 Answers0