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useEffect – React
react.dev · 7,409 words · saved by 1 readers
The library for web and native user interfaces
API Reference Hooks Copy page Copy useEffect 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
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