Related Topics
Introduction To Node.Js
Lesson 25: Node.js Introduction
Objective:
Introduction Node.js as a runtime environment for server-side applications.
Node.js has transformed server-side development with its event-driven, non-blocking I/O model. Let's delve into its core aspects:
Overview of Node.js and its features
- Node.js: A JavaScript runtime built on Chrome's V8 JavaScript engine, enabling the execution of JavaScript code outside the browser.
- Features: Offers a single-threaded, event-driven architecture that excels in handling asynchronous operations.
Asynchronous nature of Node.js
- Non-blocking I/O: Allows Node.js to handle concurrent requests without getting blocked, enhancing scalability and performance.
- Callback-based: Relies on callbacks to handle asynchronous operations, ensuring smooth execution of tasks.
Use cases and applications of Node.js
- Real-time applications: Ideal for building chat applications, gaming servers, and real-time collaboration tools due to its event-driven nature.
- API development: Well-suited for building RESTful APIs and microservices.
- Server-side rendering: Powers server-side rendering in frameworks like Next.js for React.
Lesson 26: Node.js Setup & Installation
Objective:
Guide students through installing and setting up the Node.js environment.
Installation process for different operating systems
- Windows: Download and run the Windows installer from the Node.js website.
- MacOS: Use Homebrew, NVM (Node Version Manager), or download the installer from the Node.js website.
- Linux: Utilize package managers like apt or install via NVM.
Node Package Manager (npm) and its usage
- npm: Node Package Manager comes bundled with Node.js, managing project dependencies, and facilitating package installation.
- Commands: Use commands like `npm install`, `npm start`, `npm run`, etc., to manage dependencies and run scripts.
Basic commands and package management using npm
- Dependency installation: `npm install package-name` to install dependencies.
- Running scripts: Define custom scripts in `package.json` and execute them using `npm run script-name`.
Lesson 27: About Npm & Package.json File
Objective:
Understand npm and the package.json file in Node.js projects.
Managing dependencies with npm
- Dependency installation: `npm install package-name` adds dependencies to the project.
- Package-lock.json: Automatically generated to lock dependency versions for consistency across environments.
Scripts and configuration in package.json
- Scripts: Define custom scripts (e.g., start, build) in `package.json` to automate tasks.
- Configuration: Specify project metadata, dependencies, and settings in `package.json`.
Semantic versioning and npm best practices
- Semantic versioning: Follow the `major.minor.patch` versioning convention to manage package versions effectively.
- Best practices: Use descriptive package names, maintain updated dependencies, and document usage instructions.
Lesson 28: Modules
Objective:
Explore modules in Node.js and their role in code organization.
Creating and exporting modules
- Module creation: Encapsulate functionality into modules using `module.exports` or ES6 `export`.
- Example:
```javascript
// math.js
const add = (a, b) => a + b;
const subtract = (a, b) => a - b;
module.exports = { add, subtract };
```
Importing modules in Node.js
- Module import: Use `require()` to import modules or ES6 `import` syntax (with Babel support).
- Example:
```javascript
// app.js
const { add, subtract } = require('./math');
console.log(add(5, 3)); // Output: 8
console.log(subtract(5, 3)); // Output: 2
```
Core modules vs third-party modules
- Core modules: Modules built into Node.js, such as `fs`, `http`, `path`, accessible without installation.
- Third-party modules: External modules from npm, expanding Node.js capabilities (express, lodash, etc.).
Understanding Node.js fundamentals, package management with npm, and module organization empowers developers to build scalable, efficient, and organized server-side applications.