According to the docs:     componentDidUpdate() is invoked immediately after updating occurs. This method is not called for the initial render.   We can use the new useEffect() hook to simulate componentDidUpdate(), but it seems like useEffect() is...
I have something like:   const [loading, setLoading] = useState(false);  ...  setLoading(true); doSomething(); // <--- when here, loading is still false.    Setting state is still async, so what's the best way to wait for this setLoading() cal...
const [count, setCount] = useState(0);    const handleClick = () =>     setCount(prevCount => {       return prevCount + 1;     });     const [count, setCount] = useState(0);    const handleClick = () => setCount(count + 1);   Coming from...
Now with use useEffects, there is a substitute for componentDidMount into a React Component with Hooks.  Scenario "initial unique call to a server":  To accomplish this, DependencyList (second argument of useEffect) in useEffect should every...
I have a React stateless component using redux and hooks. I need to display the number of items on page load (useEffect) and update it every time I add or remove an item (store.subscribe)  useEffect(() => {     setState({         items: store.getS...
I am new to ReactJS and working with Hooks. I want to set state for object. Here is my code:  const StartPage = (props)=> {     const [user,setUser] = useState('')     const [password,setPassword] = useState('')      const [info,se...
I setup this reducer.js file to use React's useReducer  https://reactjs.org/docs/hooks-reference.html#usereducer  import {useReducer} from 'react';  const initialState = {   test: 0, };  const reducer = (state, action) => {   switch (a...
In this example, I have this react class:  class MyDiv extends React.component    constructor(){       this.state={sampleState:'hello world'}    }    render(){       return <div>{this.state.sampleState}    } }   The question is if I can...
I have gone through hooks introduced in react v16.7.0.   https://reactjs.org/docs/hooks-intro.html  So my understanding about hooks is we can play with state in functional component without writing class components in react. This is really amazing fe...
According to react document, useEffect will trigger clean-up logic before it re-runs useEffect part.     If your effect returns a function, React will run it when it is time to clean up...      There is no special code for handling updates because us...

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