How to avoid repeated code execution with JavaScript

I like to go to some large websites and look through their original code, hoping to find some patterns that can be applied to my own code, or discover some tools that I have never heard of before. and skills. However, when I look at the source code of these large websites, I often find a problem, that is, repeated code execution and repeated functional applications. Below are some problems found when viewing their source code. I share these with you, hoping that you can write JavaScript code more concisely and efficiently.

Duplicate Collection Elements

The most common problem I see in their JavaScript code is duplicate collection elements. Although the execution speed of the jQuery selector engine or querySelectorAll is very fast, repeated work will take up more time and resources. This problem is very simple, and the solution is as follows:

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