Temporal Dead Zone is a term that describes the position where variables are unreachable;
Here,
- Temporal means, temporary
- Dead means, not in a working state
- Zone means, the area where data is stored
The variables let and const exists in Temporal Dead Zone
TL;DR Temporal Dead Zone(TDZ) ends as soon as the respective variable is called.
/*
Temporal Dead Zone for the name variable
*/
const name = "SnowBit" // Haha, TDZ just ended
console.log(name)
Why was Temporal Dead Zone(TDZ) created?
//Temporal Dead Zone for the name variable
//Temporal Dead Zone for the name variable
//Temporal Dead Zone for the name variable
console.log(name) // Huh, I am in Temporal Dead Zone, let's get out of it
//Temporal Dead Zone for the name variable
//Temporal Dead Zone for the name variable
const name = "SnowBit" // Haha, TDZ just ended
As you can see, the name variable is declared in TDZ and will show error
Thank you for reading, have a nice day!
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Top comments (1)
So far, so good ...
To elaborate on an answer, you could add an example of variable hoisting when using
varinstead ofconstand explain why it is a benefit to see an error message instead of working (unintendedly) with anundefinedvalue.