A Technical Overview of React Basics


In this comprehensive guide, we will delve into the fundamentals of React basics, helping you understand its core concepts and providing a technical analysis of its key features.

React Introduction

React, at its core, is a JavaScript library for building user interfaces. What sets it apart is its ability to create reusable UI components. This modular approach allows developers to build complex applications by composing small and isolated pieces of code. Before diving into the technical intricacies, let’s understand the basics.

React Basics Fundamentals

React Components

At the heart of React development are components. A React basics component is a self-contained, reusable piece of code responsible for rendering a part of the user interface. Components can be as simple as a button or as complex as an entire form. The reusability of components enhances code maintainability and promotes a clean and organized codebase.

JSX Syntax

React introduces JSX, a syntax extension for JavaScript that looks similar to XML or HTML. JSX allows developers to write UI components in a format that resembles the final output, making the code more readable and expressive. Under the hood, JSX is transformed into JavaScript code by the compiler.

React Technical Analysis

Virtual DOM

One of the key features that make React highly performant is its use of a Virtual DOM. When changes occur in an application, a virtual representation of the DOM is created. Compares this virtual DOM with the actual DOM, identifying the differences (referred to as “diffing”), and updates only the necessary parts of the real DOM. This minimizes the number of manipulations on the actual DOM, resulting in a faster and more efficient rendering process.

React State Management

React basics components can hold and manage their internal state. The state represents the data that can change during the lifetime of a component. By utilizing state, developers can build dynamic and interactive user interfaces. When the state of a component changes, efficiently re-renders only the affected parts, maintaining a responsive and seamless user experience.


Props, short for properties, are a mechanism for passing data from a parent component to its child components. Props enable the flow of information between components, allowing for greater flexibility and reusability. By passing props to child components, you can customize their behavior and appearance based on the parent’s requirements.

React Lifecycle Methods

Understanding the lifecycle of a component is crucial for managing its behavior at different stages. React provides lifecycle methods that allow developers to execute code at specific points in a component’s lifecycle, such as when it is about to be rendered, updated, or unmounted.

  • componentDidMount: Executed after the component is rendered for the first time.
  • componentDidUpdate: Triggered after the component is updated.
  • componentWillUnmount: Invoked just before the component is unmounted and destroyed.

Leveraging these lifecycle methods provides developers with fine-grained control over the behavior of their components throughout their lifecycle.

What the Expertify team thinks about this topic

Mastering the fundamentals of React is essential for building modern and efficient web applications. This technical overview has provided insights into React’s core concepts, including components, JSX syntax, the Virtual DOM, state management, props, and lifecycle methods. Armed with this knowledge, developers can create robust and interactive user interfaces with ease. As continues to evolve, staying informed about its latest features and best practices will be key to staying at the forefront of web development.

Tutorial: Intro to React

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