One Code that Teaches 5 Core Concepts of ReactJS (Plus 5 Bonus Programming Logics)

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Want to understand the core of ReactJS while diving into some useful programming logic which is mostly asked in coding round interviews. This one simple piece of code will introduce you to 5 core React concepts and 5 bonus programming techniques in a way that even an 8th grader can follow. By the end, you’ll feel confident in your understanding of React and key programming practices!

Let’s Meet Our Code

The code we’re using fetches a list of users from the internet and allows you to filter them using a search bar. As we go through, you’ll learn React concepts like components, state, useEffect(), events, and rendering, plus some programming logic like filtering, fetching, error handling, map(), and using unique keys.

import React, { useState, useEffect } from 'react';
import { createRoot } from 'react-dom/client';

function FilterData() {
  const [data, setData] = useState([]);
  const [filteredData, setFilteredData] = useState([]);
  const [searchTerm, setSearchTerm] = useState('');

  useEffect(() => {
    const fetchData = async (url) => {
      try {
        const response = await fetch(url);
        const data = await response.json()…