Q131. Does Promise.all() cancel the other Promises?
No. `Promise.all()` does not cancel the other promises. It only waits for all of them to finish, and if any one rejects, the overall `Promise.all()` call rejects immediat...
Technical Question Bank · Peer-Reviewed
Job Interview Questions and Answers Directory
Search and filter frequently asked interview questions across technical, programming, and behavioral domains. Tailor your interview preparation by difficulty for freshers or experienced developers (1,100 available).
Active:
Tag: javascript ×
Q132. How to focus an input element on page load?
You need to use `useEffect` hook to set focus on input field during page load time for functional component. ```jsx harmony import React, { useEffect, useRef } from "reac...
Q133. What is the purpose of the race method in promise?
Promise.race() method will return the promise instance which is firstly resolved or rejected. Let's take an example of race() method where promise2 is resolved first ```j...
Q134. How can we find the version of React at runtime in the browser?
You can use `React.version` to get the version. ```jsx harmony const REACT_VERSION = React.version; ReactDOM.render( {`React version: ${REACT_VERSION}`}, document.getElem...
Q135. What is a strict mode in javascript?
JavaScript’s "use strict" directive is used to opt into a stricter parsing and error-handling mode for your scripts or functions. It helps catch common bugs, makes your c...
Q136. How to add Google Analytics for React Router?
Add a listener on the `history` object to record each page view: ```javascript history.listen(function (location) { window.ga("set", "page", location.pathname + location....
Q137. Why do you need strict mode?
Strict mode is useful to write "secure" JavaScript by notifying "bad syntax" into real errors. For example, it eliminates accidentally creating a global variable by throw...
Q138. How do you apply vendor prefixes to inline styles in React?
React _does not_ apply _vendor prefixes_ automatically. You need to add vendor prefixes manually. ```jsx harmony ```
Q139. How do you declare strict mode?
The strict mode is declared by adding "use strict"; to the beginning of a script or a function. If declared at the beginning of a script, it has global scope. ```javascri...
Q140. How to import and export components using React and ES6?
You should use default for exporting the components ```jsx harmony import User from "user"; export default function MyProfile { return //...; } ``` See Class ```jsx harmo...