JAVASCRIPT

componentdidmount hooks

For componentDidMount
useEffect(() => {
  // Your code here
}, []);

For componentDidUpdate
useEffect(() => {
  // Your code here
}, [yourDependency]);

For componentWillUnmount
useEffect(() => {
  // componentWillUnmount
  return () => {
     // Your code here
  }
}, [yourDependency]);

component did mount in hooks

For componentDidMount
useEffect(() => {
  // Your code here
}, []);

For componentDidUpdate
useEffect(() => {
  // Your code here
}, [yourDependency]);

For componentWillUnmount
useEffect(() => {
  // componentWillUnmount
  return () => {
     // Your code here
  }
}, [yourDependency]);

componentdidmount in hooks

For componentDidMount
useEffect(() => {
  // Your code here
}, []);

For componentDidUpdate
useEffect(() => {
  // Your code here
}, [yourDependency]);

For componentWillUnmount

react hooks componentdidmount

// import useEffect from 'react';

useEffect(() => {
	// your code here
}, []);

componentdidmount in hooks

useEffect(() => {
  // Your code here
}, []);

componentdidmount functional hook

import { useState, useEffect } from 'react';

function getWindowDimensions() {
  const { innerWidth: width, innerHeight: height } = window;
  return {
    width,
    height
  };
}

export default function useWindowDimensions() {
  const [windowDimensions, setWindowDimensions] = useState(getWindowDimensions());

  useEffect(() => {
    function handleResize() {
      setWindowDimensions(getWindowDimensions());
    }

    window.addEventListener('resize', handleResize);
    return () => window.removeEventListener('resize', handleResize);
  }, []);

  return windowDimensions;
}

componentdidmount react hooks

export default function useDidMountHook(callback) {
  const didMount = useRef(null)

  useEffect(() => {
    if (callback && !didMount.current) {
      didMount.current = true
      callback()
    }
  })
}

componentdidmount react hooks

useEffect(() => {
  // Your code here
}, [yourDependency]);

componentdidmount react hooks

useEffect(() => {
  // componentWillUnmount
  return () => {
     // Your code here
  }
}, [yourDependency]);

componentdidmount react hooks

useEffect(() => {
  // <div>{count}</div>
}, [count]);

componentdidmount react hooks

useEffect(() => {
  console.log("I have been mounted")
}, [])

componentdidmount react hooks

const num = 5

useEffect(() => {
  console.log("I will only run if my deps change: ", num)
}, [num])

componentdidmount react hooks

useEffect(() => {
  const someFunc = () => {
    console.log("Function being run after/on mount")
  }
  someFunc()
}, [])

componentdidmount react hooks

const msg = "some message"

const myFunc = useCallback(() => {
  console.log(msg)
}, [msg])

useEffect(() => {
  myFunc()
}, [myFunc])