ReactJS is a JavaScript library for building user interfaces with features such as JSX, and virtual DOM for efficient updates and unidirectional data flow.
Mern stack is a combination of four technologies that work together as a very powerful full-stack web development stack. It is a pre-built javascript-based technology stack that consists ofMongoDB,Express.js,React.js, andNode.js. In the Mern stack, MongoDB is a document database that works...
React allows us to encapsulate logic in components, so we can skip the fancy JavaScript closures and just use our component to write a debounce function.Let’s take a look:Live, editable JSX Snippet: const { useState, useRef, useEffect } = React // just an async helper function fakeAPI...
importReactfrom"react";import{useState,useEffect}from"react";importaxiosfrom"axios";constApp=()=>{const[messageData,setMessageData]=useState([]);useEffect(()=>{// add the client to the serverconstnewConnection=newEventSource("http://localhost:5000/addClient");newConnection.addEventListener("messa...
What is GraphQL? Exploring GraphQL endpoints using GraphiQL Fetching component data using useState and useEffect Environment variables in create-react-app Writing a custom Contentful hook Catching GraphQL API errors Nailing down components with React PropTypes ...
Hooks are a feature introduced in React 16.8 that enable developers to use state and lifecycle features in functional components, rather than relying on class components. The most commonly used hooks are useState and useEffect. Example: importReact,{useState,useEffect}from'react';functionExample(){co...
Now in ourApp.jswe can simply import the new function and start using it immediately. import { useEffect, useState } from "react"; import { fetchPerson } from "./fetcher"; function App() { const [personID, setPersonID] = useState(1); ...
function useEffect(fn, whatDeps, whenDeps) { const cb = React.useMemo(() => fn, whatDeps); React.useEffect(() => { cb(); }, whenDeps); } Not sure what's the use case for this is 👎 1 Contributor bvaughn commented Sep 11, 2020 The lint rule is very important. Omitting...
Head over to yourApp.jsand replace it with the following: import { useEffect, useState } from 'react'; import './App.css'; function App() { const makeAPICall = async () => { try { const response = await fetch('http://localhost:8080/', {mode:'cors'}); ...
Memoization is an optimization technique used to accelerate applications. This blog guides users in implementing memoization in React applications.