Скачать или смотреть JavaScript var, let and const hoisting | temporal dead zone - JSUniv

I have been playing with ES6 for a while and I noticed that while variables declared with var are hoisted as expected... Does this mean that variables declared with let or const are not hoisted? What is really going on here? Is there any difference between let and const in this matter?


Simply saying....:)


All declarations (var, let, const, function, function*, class) are "hoisted" in JavaScript. This means that if a name is declared in a scope, in that scope the identifier will always reference that particular variable.


Follow us
  / lee.dev.5811  




Learn more about hoisting check these links

Lexical scoping

   • JavaScript Lexical Scoping - JSUniv  

Closure
   • JavaScript Closure deep explanation - JSUniv  


Contents:
1. Understanding hoisting
2. Temporal dead zone
3. Name declarations with var, let and const
4. analyze the difference using for loop with setTimeout() async call