useEffect Hook | React | Javascript
useEffect is a React Hook that lets you synchronize a component with an external system.
useEffect(setup, dependencies?)
Reference
useEffect(setup, dependencies?)
Usage
Connecting to an external system
Wrapping Effects in custom Hooks
Controlling a non-React widget
Fetching data with Effects
Specifying reactive dependencies
Updating state based on previous state from an Effect
Removing unnecessary object dependencies
Removing unnecessary function dependencies
Reading the latest props and state from an Effect
Displaying different content on the server and the client
Troubleshooting
My Effect runs twice when the component mounts
My Effect runs after every re-render
My Effect keeps re-running in an infinite cycle
My cleanup logic runs even though my component didn’t unmount
My Effect does something visual, and I see a flicker before it runs
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