Скачать или смотреть 📚 Why Calling Arrow Functions Before Initialization Causes an Error

When you declare an arrow function using const or let, JavaScript temporarily hoists the variable to the top of its scope, but it doesn't assign the function to it until the point of initialization in the code. This creates a Temporal Dead Zone (TDZ) — a period where the variable exists in memory but hasn’t been assigned a value yet.

If you try to call the arrow function before it is initialized (before the assignment), JavaScript will throw a ReferenceError. This happens because, during the TDZ, the variable is not yet considered fully initialized or accessible.

In simpler terms, although the variable exists, it is in a "dead zone" where you cannot access it. This prevents you from accidentally calling a function before it has been properly set up, which could lead to bugs or unexpected behavior in your code.

When you declare an arrow function using const or let, JavaScript temporarily hoists the variable to the top of its scope, but it doesn't assign the function to it until the point of initialization in the code. This creates a Temporal Dead Zone (TDZ) — a period where the variable exists in memory but hasn’t been assigned a value yet.

If you try to call the arrow function before it is initialized (before the assignment), JavaScript will throw a ReferenceError. This happens because, during the TDZ, the variable is not yet considered fully initialized or accessible.

In simpler terms, although the variable exists, it is in a "dead zone" where you cannot access it. This prevents you from accidentally calling a function before it has been properly set up, which could lead to bugs or unexpected behavior in your code.
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