An API is a way to send and fetch information between various interfaces and in real-time from the server or send data to the server. Use the Getuser() Function to Call and Get Response of the API in JavaScript
In this step, you created a local API. You learned how to create a static file with default values and how to fetch or update those values using RESTful actions such asGETandPOST. In the next step, you’ll create services to fetch data from the API and to display in your application....
Here's an example of how you can call a function to fetch data only once - when the component mounts. import{useEffect, useState}from'react';constApp=()=>{const[data, setData] =useState({data: []});const[err, setErr] =useState('');useEffect(()=>{// 👇️ this only runs once...
useMemo is a function provided by React, a popular JavaScript library for building user interfaces. It is used to optimize performance by memoizing the result of a computation and only recalculating it when necessary. When a component renders, any calculations or expensive operations inside it can ...
Let’s start with a simple example where we use a callback function to update the state based on the previous state. This is particularly useful when you want to increment a counter based on its current value. import React, { useState } from 'react'; const Counter = () => { const ...
2. Using Intersection Observer API The Intersection Observer API asynchronously observes the changes and loads images as the element enters the viewport. The prior approach required us to bind events, consider performance, and build a mechanism to determine if an element was in the viewport or not...
Install the latest version of Node.js on your system. The latest version of React, version 18 requires node.js version 14 or higher. Install any IDE of your choice. In this example, Visual Studio Code is used. Writing Unit Tests for React Components Unit tests are performed to test an ...
setState Callback in Functional Component importReact,{useEffect,useState}from'react';functionApp(){const[age,setAge]=useState(0);updateAge(value){setAge(value);};useEffect(()=>{if(age!==0&&age>=21){// Make API call to /beer}else{// Throw error 404, beer not found}},[age]);retu...
In this tutorial, Chidi Orji will show you how to build a React drag-and-drop component for file and image uploads. In the process, we’ll learn about the HTML drag-and-drop API. We will also learn how to use the useReducer hook for managing state in a React functional component. ...
Context APIand the React HookuseContext()in your React project. The Context API is a React structure that allows you to share specific data from all levels of your application and aids in solving prop-drilling. React Hooks are functions that serve as a modular replacement for state and lifecyc...