ToolKit-JS | lightweight front end library that contains a lot
kandi X-RAY | ToolKit-JS Summary
kandi X-RAY | ToolKit-JS Summary
This is a lightweight front end library that contains a lot of powerful utilities, while remaining small in size.
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QUESTION
EDIT
It caused by in
index.js
. I am not sure why but it is odd.
I noticed hook useSelector()
caused the app re-render needlessly. Is this expected? If yes, should I drop using redux-toolkit-js
?
I haven't tested this behavior on React Native but I think re-rendering in React Native will become an issue.
Hook useSelector
caused the app to re-render 2 times more and it compounds, meaning If the app without Redux
will re-render only 2 times, caused by a state update, simply calling useSelector()
will cause the app to re-render 4 times.
This is the steps I took to reproduce the problem:
- npx create-react-app my-app --template redux
- cd my-app
- npm start
- add console.log in
App.js
andfeatures/counter/Counter.js
ANSWER
Answered 2020-Sep-22 at 11:33React does an extra render in development environments in strict mode to help you find bugs and do some checks for you. It doesn't do this in a production build.
From the docs for strict mode:
Strict mode can’t automatically detect side effects for you, but it can help you spot them by making them a little more deterministic. This is done by intentionally double-invoking the following functions:
- Class component
constructor
,render
, andshouldComponentUpdate
methods- Class component static
getDerivedStateFromProps
method- Function component bodies
- State updater functions (the first argument to
setState
)- Functions passed to
useState
,useMemo
, oruseReducer
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