If I want to call API after the first rendering of component, I know we have useEffect hook to call the API method. (I am talking about functional components only. No class component). Is there an...

How can the useEffect hook (or any other hook for that matter) be used to replicate componentWillUnmount? In a traditional class component I would do something like this: class Effect extends Rea...

I want to destroy some component that i have instantiated to release memory. In my current app almost every view that i instantiate and then release it (remove reference to it) doesn't get garbage...

I want to execute a function in Child Component after props gets changed in the Parent Component without having to manage an extra state in Child/Parent. <ParentCompoenent myCallback={() =>...

Is there ever a situation where componentDidUpdate would NOT fire, even if the props updated in React?

I'm trying to pass props from a parent component to a child component and even though its getting called twice (dunno why, componentDidMount should get called only once) the props seem to be empty....

I'm trying to create a copy of this spinning div example using react hooks. https://codesandbox.io/s/XDjY28XoV Here's my code so far import React, { useState, useEffect, useCallback } from 'react...

I am implementing a simple user authentication system using react js and node js api. This is what i am doing inside ComponentWillMount method :- 1.checking if the token exits (in localStorage) 2....

Background I am working on a Meteor app that uses ReactJS as the rendering library. Currently, I'm having trouble with having a Child component re-render when data has been updated, even though t...

I'm trying to fetch the data from the server after component has been updated but I couldn't manage to do that. As far as I understand componentWillUnmount is called when component is about to be d...

I've got a simple react app that has a Login that receives a Json Web Token on successful authentication and the passes it to a sibling component (Members) that in its componentDidMount uses this J...

In the React lifecycle function shouldComponentUpdate(nextProps, nextState), nextProps is self explanatory. But what does nextState do? It doesn't sound right that I can evaluate upcoming state b...