Finally react team listened to us The recent introduction of parsing custom hooks in react dev tools option might help . Before parsing ( before clicking the magic button in custom hooks card ) . . After parsing ( clicking the magic button in the top right )
The problem in your code is with {}. UseEffect hook expects and array, not an object. Use [initialDesc] instead. This is how you reset component state when props change const GenerateDescHook = ({ description: initialDesc }) => { const [description, setDescription] = useState(null) useEffect(() => { setDescription(initialDesc) }, [initialDesc]); } This is how you initialize … Read more
You should add name attributes to input tags. Each name must refer to key in AllValues object. const [allValues, setAllValues] = useState({ mobile: ”, username: ”, email: ”, password: ”, confirmPassword: ” }); const changeHandler = e => { setAllValues({…allValues, [e.target.name]: e.target.value}) } return ( <input type=”text” className=”form-control” id=”mobile” name=”mobile” placeholder=”Enter a valid mobile number” … Read more
If you have a useEffect(() => {}, itemArray) and you modify itemArray, you will get this error. this is probably just a typo. I did this when I had a list of items I was using from state. It didn’t catch it because it was an array. You need [] around the itemArray. useEffect(() => … Read more
Inside your useEffect you are logging list: console.log(list); So you either need to remove the above line, or add list to the useEffect dependencies at the end. so change this line }, [term]); to }, [term, list]);
I’ve found a useful alternative to the solutions proposed here. As mentioned in this Reddit topic, the React team apparently recommends something like: // Pass the callback as a dependency const useCustomHook = callback => { useEffect(() => { /* do something */ }, [callback]) }; // Then the user wraps the callback in `useMemo` … Read more
Instead of passing the entire object to the dependency array, make sure that you only pass name. Which you can do by returning the names const [objects, setObjects] = useState([]) useEffect(()=> { getAllObjects() }, [getAllObjects, …objects.map(item => item.name)])
There is no effective difference. First is creating a function using Arrow function expressions syntax and storing it to a constant and the second is creating a plain function. Both are functions that will perform the exact same task, return the component JSX code for rendering. Also, there is no such term nor concept “Const … Read more
As @Ying Zuo said, your method works only with Functional Components. To solve this problem: Instead of this line: const counter = useSelector(state => state.counter); You define the counter state like this: const mapStateToProps = state => ({ counter: state.counter }); Then for dispatching you should use it like this: const mapDispatchToProps = () => … Read more
useEffect from React Hooks is by default executed on every render, but you can use second parameter in function to define when the effect will be executed again. That means that function is always executed on mount. In your situation your second useEffect will be run on start and when detailIndex changes. More info: https://reactjs.org/docs/hooks-effect.html … Read more