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.
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