What is a Temporal Dead Zone?

 Temporal Dead Zone is a behaviour that occurs with variables declared using let and const keywords.

It is a behaviour where we try to access a variable before it is initialized.

Examples of temporal dead zone:

x = 23; // Gives reference error

let x;


function anotherRandomFunc(){
  message = "Hello"; // Throws a reference error

  let message;
}
anotherRandomFunc();

In the code above, both in global scope and functional scope, we are trying to access variables which have not been declared yet. This is called the Temporal Dead Zone .