TLDR useCallback: “cache a function in a functional component” useMemo: “cache an attribute in a functional component” General Usecase “I don’t want my child component to be re-rendered if only part of my state that are irrelevant to my child component has changed” You will start to think of those scenarios when you…

The other day I was about to submit my final merge request to GitLab, but I realized that there were 33 commits and over 20 files changed, I should realize it in the very beginning, but it was hard when I started to work on a feature and don’t want…

I’m learning react-redux through building a shopping website, I wasn’t totally mastering it but I have to write something to clear my thoughts. Config Redux It takes time to config redux before implementing any functions related to this. The very first movement is to npm install react-redux redux and redux-logger. …

Well, these should be three separate topics but I just want to do a quick sum-up of what I learned today. Shallow Copy shallow copy only copy one layer of the original array, what I mean by one layer is like that: const oriArr = ["1","2","3"]; const copyArr = oriArr.slice(); …

Hi there, I did a code test about cleaning the Nodejs/Express code smell and I realized I did not fully understand how Nodejs/Express works and what are the newest writing styling used ES6/7 syntax. …