Front-End Programming Exam > Front-End Programming Videos > Learn React JS: Fundamentals for Front-End Developers (in Hindi) > Deep Dive in setState in ReactJS - Hindi / Urdu Tutorial
Deep Dive in setState in ReactJS - Hindi / Urdu Tutorial Video Lecture | Learn React JS: Fundamentals for Front-End Developers (in Hindi) - Front-End Programming
FAQs on Deep Dive in setState in ReactJS - Hindi / Urdu Tutorial Video Lecture - Learn React JS: Fundamentals for Front-End Developers (in Hindi) - Front-End Programming
| 1. ReactJS में setState क्या होता है? |  |
उत्तर: setState एक ReactJS मेथड है जो एक कंपोनेंट के state को अपडेट करने के लिए उपयोग किया जाता है। यह मेथड नए state के लिए एक परियोजना को रेंडर करता है और उपयोगकर्ता इंटरैक्शन के परिणामस्वरूप विशेष रूप से अद्यतित होता है।
| 2. setState को कैसे उपयोग करें? | |
उत्तर: नीचे दिए गए उदाहरण को देखें:
```jsx
import React, { Component } from 'react';
class MyComponent extends Component {
constructor(props) {
super(props);
this.state = {
count: 0
};
}
incrementCount = () => {
this.setState({ count: this.state.count + 1 });
}
render() {
return (
<div>
<p>Count: {this.state.count}</p>
<button onClick={this.incrementCount}>Increment</button>
</div>
);
}
}
```
उपरोक्त उदाहरण में, हमने `setState` का उपयोग करके `count` state को अपडेट किया है। यदि `incrementCount` बटन पर क्लिक किया जाता है, तो `count` state की मान एक वृद्धि होगी।
| 3. ReactJS में setState का उपयोग क्यों किया जाता है? | |
उत्तर: setState का उपयोग करने से ReactJS कंपोनेंट में नए state को अपडेट किया जा सकता है। इसके द्वारा कंपोनेंट रेंडर होता है और उपयोगकर्ता के द्वारा किये गए इंटरैक्शन के आधार पर पुनर्लोड होता है।
| 4. setState का उपयोग करने के लिए क्या प्रतिबंध हैं? | |
उत्तर: setState को कंपोनेंट के जीवनकाल के दौरान कभी भी नहीं बुलाना चाहिए। यह इन्फिनिट लूप का कारण बन सकता है और ऐसा करने से प्रदर्शन पर असर पड़ सकता है। इसके बजाय, `componentDidMount` या `componentDidUpdate` जैसे शिकारी तर्कों के अंदर `setState` को बुलाएं।
| 5. setState कैसे अपडेट करता है? | |
उत्तर: setState को बुलाने पर, ReactJS नए state और परियोजना को रेंडर करता है। यह नए state का उपयोग करता है और पिछले state के लिए एक व्यक्तिगत प्रतिनिधि को छोड़ देता है। इसके बाद उपयोगकर्ता के इंटरैक्शन के आधार पर पुनर्लोड होता है।
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Nov 06, 2024 Last updated |
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