Technical Question Bank · Peer-Reviewed
Search and filter frequently asked interview questions across technical, programming, and behavioral domains. Tailor your interview preparation by difficulty for freshers or experienced developers (154 available).
You can use AJAX libraries such as Axios, jQuery AJAX, and the browser built-in `fetch`. You should fetch data in the `componentDidMount()` lifecycle method. This is so y...
**Render Props** is a technique for sharing code/logic between components using a prop whose value is a function that returns a React element. Instead of duplicating stat...
You need to follow two steps to use your store in your container: 1. **Use `mapStateToProps()`:** It maps the state variables from your store to the props that you specif...
React Class Components can be made much more concise using the class field declarations. You can initialize the local state without using the constructor and declare clas...
The constructor is mainly used for two purposes, 1. To initialize local state by assigning object to this.state 2. For binding event handler methods to the instance For e...
No, it is not mandatory. i.e, If you don’t initialize state and you don’t bind methods, you don’t need to implement a constructor for your React component.
You should not call `setState()` in `componentWillUnmount()` because once a component instance is unmounted, it will never be mounted again.
This lifecycle method is invoked after an error has been thrown by a descendant component. It receives the error that was thrown as a parameter and should return a value ...
An update can be caused by changes to props or state. The below methods are called in the following order when a component is being re-rendered. 1. static getDerivedState...
Below methods are called when there is an error during rendering, in a lifecycle method, or in the constructor of any child component. 1. static getDerivedStateFromError(...
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