Var, Let, and Const – What's the Difference?

Var, Let, and Const – What's the Difference?

Learn the difference between var, let and const keywords and how you should use them in your code. var declarations are globally scoped or function scoped while let and const are block scoped. var variables can be updated and re-declared within its scope; let variables can be updated but not re-declared; const variables can neither be updated nor re-declared. They are all hoisted to the top of their scope.

Learn the difference between var, let and const keywords and how you should use them in your code.

Since ES2015, JavaScript has released two more keywords as an alternative to var. They are let and const keywords. These two keywords are included in JavaScript to fix some weird behaviors of var keyword that have been causing errors when building JavaScript applications.

To understand the differences between var, let, and const, you need to learn more about var first.





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