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<\/p>\nA 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. A block is a pair of braces ( {…} ) used to group multiple statements.<\/p>\n
The temporal Dead Zone is the period of time during which the let and const declarations cannot be accessed.<\/p>\n
The Temporal Dead Zone starts when the code execution enters the block which contains the let or const declaration and continues until the declaration has been executed.<\/p>\n
Temporal Dead Zone Basically work on let and const not work on var<\/p>\n
let and const does not hoist they are held in a scope called TDZ<\/p>\n
<\/p>\n
The temporal Dead Zone is the period of time during which the let and const declarations cannot be accessed.<\/p>\n
The temporal Dead Zone starts when the code execution enters the block which contains the let or const declaration and continues until the declaration has been executed.<\/p>\n
In our code example above, Temporal Dead Zone starts after the opening parenthesis of the printAge function and continues until after the declaration of the age variable.<\/p>\n
Consider the following code example that illustrates an interesting point about the Temporal Dead Zone.<\/p>\n
The final salient difference between let \/ const and var is that if you access var before it’s declared, it is undefined. But if you do the same for let and const, they throw a ReferenceError.<\/p>\n
![\"\"](\"https:\/\/innovationm.co\/wp-content\/uploads\/2023\/07\/Screenshot-176-300x127.png\")
<\/p>\n
Therefore, a let (or const) variable\u2019s TDZ ends when JavaScript fully initializes it with the value specified during its declaration.<\/p>\n
However, a var variable\u2019s TDZ ends immediately after its hoisting\u2014not when the variable gets fully initialized with the value specified during its declaration.<\/p>\n","protected":false},"excerpt":{"rendered":"
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. A block is a pair of braces ( {…} ) used to group multiple statements. The temporal Dead Zone is the period of time during which the let […]<\/p>\n","protected":false},"author":1,"featured_media":7779,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[256,360,71,585,570,258],"tags":[722,770,888,765,889],"class_list":["post-7776","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java-application","category-javascript","category-mobile","category-mobile-app-development","category-software-testing","category-web-technology","tag-blog","tag-bloggers","tag-tdz","tag-technology","tag-temporal-dead-zone"],"yoast_head":"\n