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Reactjs – Set new state in object in array

I have a problem with updating my object in array. const [list, setList] = useState([]); const changeRecordIndex = list.findIndex((recordItem) => recordItem.id === recordID); I creat new array, copy object wich i need and then change one parametr of object. It's…

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Reactjs – why the first value of this.state array is undefined?? React

import React, {Component} from "react" import './index.css'; export default class ListArticle extends Component { constructor(props) { super(props); this.state = { arrayJson: [""], } } get() { fetch("http://localhost:8080/getHeaders", { method: "GET" }) .then(data=>data.json()) .then((data)=>{ this.setState({arrayJson:data.headerArray}) } ) } componentDidMount() { this.get();…

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Flutter – Why does using ref.watch in Riverpod cause my Notifier to be disposed and recreated, but ref.read does not?

I’m working with Flutter Riverpod and have encountered different behaviors when using ref.watch versus ref.read in my DumTabNotifier class. Here’s a simplified version of my code: import 'package:flutter/material.dart'; import 'package:flutter_riverpod/flutter_riverpod.dart'; import 'package:get/get.dart'; // Notifier class class DumTabNotifier extends Notifier<DumTabState> {…

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