Temporal Dead Zone

By xyz on 2 weeks ago|0 comment||

A temporal dead zone (TDZ) is the area of a block where a variable is inaccessible until the moment the computer completely initializes it with a value.

Suppose you attempt to access a variable before its complete initialization. In such a case, JavaScript will throw a ReferenceError.

console.log(varNumber); // undefined
console.log(letNumber); // it throws a ReferenceError letNumber is not defined

var varNumber = 1;
let letNumber = 1;

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