Front-End Programming Exam > Front-End Programming Videos > Learn React JS: Fundamentals for Front-End Developers (in Urdu) > React JS In Urdu ~ React Component Lifecycle Events (Part 6 of 6)
React JS In Urdu ~ React Component Lifecycle Events (Part 6 of 6) Video Lecture | Learn React JS: Fundamentals for Front-End Developers (in Urdu) - Front-End Programming
FAQs on React JS In Urdu ~ React Component Lifecycle Events (Part 6 of 6) Video Lecture - Learn React JS: Fundamentals for Front-End Developers (in Urdu) - Front-End Programming
| 1. What are React component lifecycle events? |  |
Ans. React component lifecycle events are methods that are automatically called at different stages of a component's life cycle. These events allow developers to perform specific actions at different points in the rendering process, such as initialization, rendering, updating, and unmounting.
| 2. How many lifecycle events are there in React? | |
Ans. In React, there are three main phases of a component's lifecycle: Mounting, Updating, and Unmounting. Each phase has specific lifecycle events associated with it. The Mounting phase includes events like constructor, render, componentDidMount, etc. The Updating phase includes events like shouldComponentUpdate, render, componentDidUpdate, etc. The Unmounting phase includes the componentWillUnmount event.
| 3. What is the purpose of componentDidMount in React? | |
Ans. componentDidMount is a React lifecycle event that is called immediately after a component is mounted or inserted into the DOM. This event is commonly used for tasks that require interaction with the DOM or external data fetching, such as initializing third-party libraries, fetching data from an API, or setting up event listeners.
| 4. How is shouldComponentUpdate used in React? | |
Ans. shouldComponentUpdate is a React lifecycle event that allows developers to control whether a component should re-render or not. By default, React will re-render a component whenever its state or props change. However, by implementing shouldComponentUpdate, developers can optimize performance by preventing unnecessary re-renders. This method takes the next props and state as arguments and returns a boolean value indicating whether the component should update or not.
| 5. When is componentWillUnmount called in React? | |
Ans. componentWillUnmount is a React lifecycle event that is called immediately before a component is unmounted or removed from the DOM. This event is commonly used for cleanup tasks, such as canceling timers, removing event listeners, or clearing any subscriptions or resources that were set up in the componentDidMount lifecycle event. It is important to perform these cleanup tasks to avoid memory leaks and ensure the component is properly unmounted.
Related Exams
About this Video
|
4.95/5 Rating |
|
Nov 06, 2024 Last updated |
Video Description: React JS In Urdu ~ React Component Lifecycle Events (Part 6 of 6) for Front-End Programming 2024 is part of Learn React JS: Fundamentals for Front-End Developers (in Urdu) preparation.
The notes and questions for React JS In Urdu ~ React Component Lifecycle Events (Part 6 of 6) have been prepared according to the Front-End Programming exam syllabus.
Information about React JS In Urdu ~ React Component Lifecycle Events (Part 6 of 6) covers all important topics for Front-End Programming 2024 Exam.
Find important definitions, questions, notes, meanings, examples, exercises and tests below for React JS In Urdu ~ React Component Lifecycle Events (Part 6 of 6).
Introduction of React JS In Urdu ~ React Component Lifecycle Events (Part 6 of 6) in English is available as part of our Learn React JS: Fundamentals for Front-End Developers (in Urdu) for Front-End Programming & React JS In Urdu ~ React Component Lifecycle Events (Part 6 of 6) in
Hindi for Learn React JS: Fundamentals for Front-End Developers (in Urdu) course. Download more important topics related with notes, lectures and mock test series for
Front-End Programming Exam by signing up for free.
Description
Video Lecture & Questions for React JS In Urdu ~ React Component Lifecycle Events (Part 6 of 6) Video Lecture | Learn React JS: Fundamentals for Front-End Developers (in Urdu) - Front-End Programming - Front-End Programming full syllabus preparation | Free video for Front-End Programming exam to prepare for Learn React JS: Fundamentals for Front-End Developers (in Urdu).
Information about React JS In Urdu ~ React Component Lifecycle Events (Part 6 of 6)
Here you can find the meaning of React JS In Urdu ~ React Component Lifecycle Events (Part 6 of 6) defined & explained in the simplest way possible.
Besides explaining types of React JS In Urdu ~ React Component Lifecycle Events (Part 6 of 6) theory, EduRev gives you an ample number of questions to practice React JS In Urdu ~ React Component Lifecycle Events (Part 6 of 6) tests,
examples and also practice Front-End Programming tests.
|
Explore Courses for Front-End Programming exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
Related Searches
shortcuts and tricks
,Important questions
,Exam
,past year papers
,React JS In Urdu ~ React Component Lifecycle Events (Part 6 of 6) Video Lecture | Learn React JS: Fundamentals for Front-End Developers (in Urdu) - Front-End Programming
,React JS In Urdu ~ React Component Lifecycle Events (Part 6 of 6) Video Lecture | Learn React JS: Fundamentals for Front-End Developers (in Urdu) - Front-End Programming
,video lectures
,mock tests for examination
,Semester Notes
,study material
,React JS In Urdu ~ React Component Lifecycle Events (Part 6 of 6) Video Lecture | Learn React JS: Fundamentals for Front-End Developers (in Urdu) - Front-End Programming
,Extra Questions
,Previous Year Questions with Solutions
,ppt
,Free
,Objective type Questions
,practice quizzes
,Sample Paper
,Viva Questions
,MCQs
,Summary
;
Study React JS In Urdu ~ React Component Lifecycle Events (Part 6 of 6) on the App
Students of Front-End Programming can study React JS In Urdu ~ React Component Lifecycle Events (Part 6 of 6) alongwith tests & analysis from the EduRev app,
which will help them while preparing for their exam. Apart from the React JS In Urdu ~ React Component Lifecycle Events (Part 6 of 6),
students can also utilize the EduRev App for other study materials such as previous year question papers, syllabus, important questions, etc.
The EduRev App will make your learning easier as you can access it from anywhere you want.
The content of React JS In Urdu ~ React Component Lifecycle Events (Part 6 of 6) is prepared as per the latest Front-End Programming syllabus.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup