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 4 of 6)
React JS In Urdu ~ React Component Lifecycle Events (Part 4 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 4 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 various stages of a component's life cycle. These events allow us to perform certain actions when the component is created, rendered, updated, or destroyed.
| 2. How many types of React component lifecycle events are there? | |
Ans. There are three types of React component lifecycle events: Mounting, Updating, and Unmounting. Mounting events are triggered when a component is being created and inserted into the DOM. Updating events occur when a component is being re-rendered due to changes in its props or state. Unmounting events are triggered when a component is being removed from the DOM.
| 3. What is the purpose of componentDidMount() lifecycle event? | |
Ans. The componentDidMount() lifecycle event is called immediately after a component is mounted and inserted into the DOM. It is commonly used for actions that require DOM nodes, such as initializing third-party libraries, making AJAX requests, or setting up event listeners.
| 4. Is it possible to update state inside the componentWillUnmount() lifecycle event? | |
Ans. No, it is not recommended to update state inside the componentWillUnmount() lifecycle event. This event is triggered just before a component is unmounted and destroyed, and it should only be used for clean-up tasks such as removing event listeners or cancelling any ongoing network requests.
| 5. How can we prevent a component from re-rendering unnecessarily? | |
Ans. We can prevent a component from re-rendering unnecessarily by implementing the shouldComponentUpdate() lifecycle event. This method allows us to control whether a component should re-render or not based on the changes in its props or state. By returning false from shouldComponentUpdate(), we can stop the re-rendering process and optimize the performance of our application.
Related Exams
About this Video
|
4.93/5 Rating |
|
Nov 06, 2024 Last updated |
Video Description: React JS In Urdu ~ React Component Lifecycle Events (Part 4 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 4 of 6) have been prepared according to the Front-End Programming exam syllabus.
Information about React JS In Urdu ~ React Component Lifecycle Events (Part 4 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 4 of 6).
Introduction of React JS In Urdu ~ React Component Lifecycle Events (Part 4 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 4 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 4 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 4 of 6)
Here you can find the meaning of React JS In Urdu ~ React Component Lifecycle Events (Part 4 of 6) defined & explained in the simplest way possible.
Besides explaining types of React JS In Urdu ~ React Component Lifecycle Events (Part 4 of 6) theory, EduRev gives you an ample number of questions to practice React JS In Urdu ~ React Component Lifecycle Events (Part 4 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
ppt
,MCQs
,Exam
,Important questions
,video lectures
,Semester Notes
,Previous Year Questions with Solutions
,mock tests for examination
,React JS In Urdu ~ React Component Lifecycle Events (Part 4 of 6) Video Lecture | Learn React JS: Fundamentals for Front-End Developers (in Urdu) - Front-End Programming
,Objective type Questions
,Extra Questions
,past year papers
,Summary
,React JS In Urdu ~ React Component Lifecycle Events (Part 4 of 6) Video Lecture | Learn React JS: Fundamentals for Front-End Developers (in Urdu) - Front-End Programming
,Sample Paper
,practice quizzes
,Free
,Viva Questions
,React JS In Urdu ~ React Component Lifecycle Events (Part 4 of 6) Video Lecture | Learn React JS: Fundamentals for Front-End Developers (in Urdu) - Front-End Programming
,study material
,shortcuts and tricks
;
Study React JS In Urdu ~ React Component Lifecycle Events (Part 4 of 6) on the App
Students of Front-End Programming can study React JS In Urdu ~ React Component Lifecycle Events (Part 4 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 4 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 4 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