Difference between Let , Var, and Const in Java Script | Hindi || Zero to Hero

Details About Var In JS . :-)
1 - var is function-scoped, which means it's only accessible within the function where it's declared or globally if declared outside of any function.
2 - Variables declared with var are hoisted, which means they are moved to the top of their containing function or global scope during compilation. However, they are not initialized until the code execution reaches the actual declaration.
3 - Variables declared with var can be redeclared within the same scope, and their values can be changed.

Detail About Let in JS :-)
1 - let is block-scoped, which means it's only accessible within the block (enclosed by curly braces) where it's declared.
2 - Variables declared with let are not hoisted in the same way as var. They are hoisted to the top of their block, but they are in a "temporal dead zone" until the actual declaration is reached. Accessing them before declaration results in a ReferenceError.
3 - Variables declared with let cannot be redeclared within the same scope, but their values can be changed.

Detail Aboit Const In JS.
1 - const is also block-scoped like let.
2 - Variables declared with const must be initialized when declared, and their values cannot be changed after initialization. They are constant.
3 - Like let, variables declared with const are not hoisted, and they are in the temporal dead zone until the actual declaration.


02:00 What is Var In javascript
05:30 What is the let in Javascript
06:30 What is Const in JS

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