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 (79 available).
`useEvent` is an **experimental hook** (not yet stable in React) designed to solve the problem of creating **stable event handlers** that always access the latest props a...
**No.** `React.memo` only performs a shallow comparison of a component's **props** — it has no visibility into context. If a component reads a value via `useContext`/`Con...
In React Router v6+, programmatic navigation (redirecting from code rather than a user clicking a link) is done with the **`useNavigate`** hook, which replaces the old `h...
_Ref forwarding_ is a feature that lets some components take a _ref_ they receive, and pass it further down to a child. ```jsx harmony const ButtonElement = React.forward...
The component lifecycle has three distinct lifecycle phases: 1. **Mounting:** The component is ready to mount in the browser DOM. This phase covers initialization from `c...
You can add/edit props passed to the component using _props proxy_ pattern like this: ```jsx harmony function HOC(WrappedComponent) { return class Test extends Component ...
_Context_ provides a way to pass data through the component tree without having to pass props down manually at every level. For example, authenticated users, locale prefe...
A child class constructor cannot make use of `this` reference until the `super()` method has been called. The same applies to ES6 sub-classes as well. The main reason for...
If the props on the component are changed without the component being refreshed, the new prop value will never be displayed because the constructor function will never up...
The lifecycle methods are called in the following order when an instance of a component is being created and inserted into the DOM. 1. `constructor()` 2. `static getDeriv...
HireXTech uses essential storage to remember your study preferences and third-party advertising cookies via Google AdSense in compliance with GDPR. You can choose to enable essential cookies only or accept all cookies. Read our Privacy Policy.