Introduction to ReactJS

In this handbook, I will walk you through the complete implementation of the To-Do List App built with ReactJS. This is a classic beginner project that introduces key concepts of React such as state management, event handling, JSX syntax, and conditional rendering.

Before jumping into the coding process, this module will give you a strong foundational understanding of the tools and objectives involved in creating the app. By the end of this module, you’ll know what React is, what a To-Do List App does, and what you’ll gain by building it.

ReactJS is an open-source JavaScript library for building dynamic user interfaces. It allows developers to create reusable UI components using a syntax called JSX, which looks like HTML but runs in JavaScript.

With features like the virtual DOM and one-way data binding, React efficiently updates and renders components based on changes in data, making it ideal for dynamic and real-time web applications.

Its key features include:

• Component-Based Architecture: UI is split into reusable components (like JavaScript functions taking props and returning UI).
• Virtual DOM: React maintains a virtual DOM and only updates parts of the real DOM that change, improving performance.
• JSX Syntax: React uses JSX, a syntax that lets you write HTML-like code in JavaScript, which is then transformed into DOM elements.
• One-Way Data Flow: Data in React flows from parent to child components, simplifying data handling.

These features make React a powerful choice for building interactive front-end applications.