Beware the Temporal Dead Zone: The Hidden JavaScript Trap Every Developer Must Know! #javascript

What Is the Temporal Dead Zone (TDZ)?
The TDZ is the period between when a let or const variable is hoisted and when it's initialized. During this time, attempting to access the variable results in a ReferenceError.

Why Does the TDZ Exist?
The TDZ enforces cleaner and safer scoping rules. By ensuring variables are initialized before use, JavaScript helps prevent subtle bugs caused by undefined or unintended values.

TDZ in Functions and Blocks:
The TDZ also applies to block scopes and function parameters.
Example -
{
let a = 5;
}

function example(param = a) {
let a = 10; // TDZ for 'a' affects the function
}
example(); // ReferenceError

Best Practices to Avoid TDZ Issues:

1. Always declare variables at the top of their scope.
2. Use const for values that won’t change, reducing the chances of unintentional misuse.
3. Initialize variables immediately after declaring them when possible.

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