How JavaScript redeclares variables

This article will explain in detail how JavaScript redeclares variables. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

Redeclare variables

Redeclaring variables using the var keyword can cause problems.

Redeclaring variables in a block also redeclares variables outside the block:

Example

Var x = 10 var / where x is 10 {x = 6; / / here x is 6} / / here x is 6

Redeclaring variables using the let keyword solves this problem.

Redeclaring variables in a block does not redeclare variables outside the block:

Example

Var x = 10 let / here x is 10 {let x = 6; / / here x is 6} / / here x is 10 on "how to redeclare variables in JavaScript" this article ends here. I hope the above content can be of some help to you, so that you can learn more knowledge. If you think the article is good, please share it for more people to see.