- 1 What is React.js?
- 2 The core concepts
- 3 Key advantages of React
- 4 React Components
- 5 Functional components
- 6 Class components
- 7 Lifecycle methods
- 8 Props and State
- 9 Building a Simple React Application
- 10 Step 1: Setup of the Development Environment
- 11 Step 2: Building a React App
- 12 Step 3: Starting the Development Server
- 13 Step 4: Creating a Custom Component
- 14 Step 5: Using the Custom Component
- 15 Final note
What is React.js?
The core concepts
Before diving into the specifics of React, it is crucial to understand its core concepts:
Components: Components are the backbone of React applications. They are independent modules that contain the behavior of a certain UI component. These components are combined to construct React apps.
Virtual DOM: The Virtual DOM, maintained by React, is a virtual representation of the actual DOM (Document Object Model). When changes are made in an application, React updates the Virtual DOM before effectively updating the Real DOM to minimize performance issues.
State and Props: State and props manage and transmit data between components. The state represents a component’s internal data, while props allow data to be transferred from parent to child components.
Key advantages of React
Just like free MERN stack training, React offers several advantages to web developers, such as:
Reusability: Reusing components across the entire application makes code cleaner and simpler to maintain.
Performance: React’s Virtual DOM ensures efficient updates, speeding up rendering and improving user experience in your free MERN stack certification projects.
Community and Ecosystem: Finding solutions is made simple by the vibrant community of React and its wide ecosystem of libraries and tools, as you’ll discover in the free MERN stack program.
The core concept and components are outlined below:
An older method of defining components in React is through class components. They can provide other features like state and are defined using ES6 classes, as you’ll learn in the free MERN stack program.
Lifecycle methods are available for class components that let you act at certain times during the component’s existence, such as when it is created, changed, or unmounted.
Props and State
State manages a component’s internal data, whereas props send data from parent to child components, as you’ll explore in the free MERN stack certification.
Building a Simple React Application
Let’s create a simple React application to put what we’ve learned into practice in your free MERN stack course. Here are the following steps:
Step 1: Setup of the Development Environment
Step 2: Building a React App
After setting up your development environment, the following step is to start a new React application. The helpful tool provided by React, “create-react-app,” streamlines the setup process and helps you save time and effort. You can prepare a functional React project with just one terminal command, as seen in the free MERN stack certification.
Step 3: Starting the Development Server
Launch a development server to see it in action as soon as your React application is complete. The development server offers a live preview of your program so that you can make changes and examine the outcomes instantly in your web browser. The short feedback loop that React development offers makes it easier to identify and fix issues as you work on your free MERN stack training projects.
Step 4: Creating a Custom Component
In React, you develop each component individually to create your user interface. To build the user interface for your program, you can assemble parts like Legos. The example above introduces you to functional and class components. Functional components are typically simpler and suggested for most scenarios, whereas class components offer more complex features like maintaining state.
Step 5: Using the Custom Component
You can easily add a custom component to your application once it has been created. React’s component-based architecture makes it easy to repurpose components throughout your program, promoting maintainability and code reuse. React’s modular approach to UI creation is one of the reasons it has gained such popularity among developers.
This comprehensive guide covers the fundamentals of React.js and its crucial role in the MERN stack. React’s component-based architecture, JSX syntax, Virtual DOM, and state management features make it a dependable and efficient choice for creating modern online apps. By taking the free MERN stack course on Simplilearn and following the guidelines for building a simple React application, you’ll be equipped to begin your career as a proficient React developer.