Why this javaScript code returns not defined

Asked Mar 04 '20 at 14:31

Active Mar 04 '20 at 14:34

Viewed 32 times

I am struggling to understand why the below code snippet returns greeting is not defined. The purpose of this question isn't how I fix it but I understand why it throws this error.

function sayHey() {
    var greeting = "Hello";
    if(greeting){
        greeting = "Hey";
       let greeting = "Hi";
        console.log(greeting);
    }
}

sayHey();

edited Mar 04 '20 at 14:33

asked Mar 04 '20 at 14:31

thstamod

It should be throwing an error due to the temporal dead zone. Not sure why you get `undefined` instead. – VLAZ Mar 04 '20 at 14:33
I see `"Uncaught ReferenceError: Cannot access 'greeting' before initialization"` – j08691 Mar 04 '20 at 14:35
Remove the ``let`` from ``let greeting``. – Azametzin Mar 04 '20 at 14:37
@Azametzin that still wouldn't produce the behaviour OP reported. – VLAZ Mar 04 '20 at 14:41

Why this javaScript code returns not defined

0 Answers0