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...
I am trying to figure out how to use a Firebase listener so that cloud firestore data is refreshed with react hooks updates.   Initially, I made this using a class component with a componentDidMount function to get the firestore data.  this.props.fir...
The standard way to use a React useState Hook is the following:  const [count, setCount] = useState(0);   However this const count variable is clearly going to be reassigned to a different primitive value.  Why then is the variable not defined as let...
I have just began playing around with React hooks and am wondering how an AJAX request should look?  I have tried many attempts, but am unable to get it to work, and also don't really know the best way to implement it. Below is my latest attempt:...
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 component using a react hook to change the text of a styled collapse/accordion panel whenever a user clicks to open it. The problem I'm having is that this logic is effecting the text for all 3 collapse panels at the same time instead of...
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...

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