Anil Singh | Code-sample.com

What is the difference between let, var, and const? In this article, I’m explaining the importance of these three keywords in JavaScript and TypeScript .   I also provided various examples to deeply understand and use them and what happened when? Let see about: V ar vs. Let vs. Const var : - 1.       var is function-scoped 2.       var return undefined when accessing a variable before it's declared let : - 1.       let is block-scoped 2.       let throw ReferenceError when accessing a variable before it's declared const :- 1.       Const is block-scoped 2.       Const throw ReferenceError when accessing a variable before it's declared 3.       Const cannot be reassigned Let see the Examples to understand what happens when - What will happen when the following ...