In order to make your website or your application faster, you will need some knowledge about performance in JavaScript. Having a good performance in your application is very important because the users don’t like using slow applications. That’s why in this article, I wanted to show you some simple tips that will help to improve the performance in JavaScript and make your website or application smooth and faster.

1. Avoid Unnecessary Variables

Having unnecessary variables on your code is not good for performance, because variables use memory. So, don’t create new variables if you don’t plan to save values. Have a look at the examples below:

Replace code like this:

Bad Performance.

With this:

Good Performance.

2. Reduce Activity in Loops

Loops are often used in programming. The for loop is executed for each iteration. Statements or assignments that can be placed outside the loop will make the loop run faster. Have a look at the examples below:

Bad Code:

Bad Code.

Better Code:

Better Performance.

The bad code accesses the length of the array for each iteration in the loop and that’s not good for performance, especially if you have a lot of statements in your program. On the other hand, the better Code accesses the length property outside the loop and makes the loop run faster.

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