🔰 Alternatives to JavaScript’s if...else statement
1️⃣ Switch Statement
Finds the matching value of an expression and executes the code block associated to the matching value.
2️⃣ Ternary Operator
Checks a condition and executes the first expression if the condition is true. Otherwise it runs the second expression.
3️⃣ Jump / Dispatch Table
Stores value-function pairs in an object to quickly fetch and run a function based on a value (which is treated as an object key).
4️⃣ Dynamic Dispatch
This pattern involves selecting which polymorphic method to call based on an object’s type.
1️⃣ Switch Statement
Finds the matching value of an expression and executes the code block associated to the matching value.
2️⃣ Ternary Operator
Checks a condition and executes the first expression if the condition is true. Otherwise it runs the second expression.
3️⃣ Jump / Dispatch Table
Stores value-function pairs in an object to quickly fetch and run a function based on a value (which is treated as an object key).
4️⃣ Dynamic Dispatch
This pattern involves selecting which polymorphic method to call based on an object’s type.
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✅ Node.js Basics You Should Know 🌐
Node.js lets you run JavaScript on the server side, making it great for building fast, scalable backend applications. 🚀
1️⃣ What is Node.js?
Node.js is a runtime built on Chrome's V8 JavaScript engine. It enables running JS outside the browser, mainly for backend development. 🖥️
2️⃣ Why Use Node.js?
- Fast & non-blocking (asynchronous) ⚡
- Huge npm ecosystem 📦
- Same language for frontend & backend 🔄
- Ideal for APIs, real-time apps, microservices 💬
3️⃣ Core Concepts:
- Modules: Reusable code blocks (e.g., fs, http, custom modules) 🧩
- Event Loop: Handles async operations ⏳
- Callbacks & Promises: For non-blocking code 🤝
4️⃣ Basic Server Example:
const http = require('http');
http.createServer((req, res) => {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello, Node.js!');
}).listen(3000); // Server listening on port 3000
5️⃣ npm (Node Package Manager):
Install libraries like Express, Axios, etc.
npm init
npm install express
6️⃣ Express.js (Popular Framework):
const express = require('express');
const app = express();
app.get('/', (req, res) => res.send('Hello World!'));
app.listen(3000, () => console.log('Server running on port 3000'));
7️⃣ Working with JSON & APIs:
app.use(express.json()); // Middleware to parse JSON body
app.post('/data', (req, res) => {
console.log(req.body); // Access JSON data from request body
res.send('Received!');
});
8️⃣ File System Module (fs):
const fs = require('fs');
fs.readFile('file.txt', 'utf8', (err, data) => {
if (err) throw err;
console.log(data); // Content of file.txt
});
9️⃣ Middleware in Express:
Functions that run before reaching the route handler.
app.use((req, res, next) => {
console.log('Request received at:', new Date());
next(); // Pass control to the next middleware/route handler
});
🔟 Real-World Use Cases:
- REST APIs 📊
- Real-time apps (chat, notifications) 💬
- Microservices 🏗️
- Backend for web/mobile apps 📱
💡 Tip: Once you're confident, explore MongoDB, JWT auth, and deployment with platforms like Vercel or Render.
💬 Tap ❤️ for more!
Node.js lets you run JavaScript on the server side, making it great for building fast, scalable backend applications. 🚀
1️⃣ What is Node.js?
Node.js is a runtime built on Chrome's V8 JavaScript engine. It enables running JS outside the browser, mainly for backend development. 🖥️
2️⃣ Why Use Node.js?
- Fast & non-blocking (asynchronous) ⚡
- Huge npm ecosystem 📦
- Same language for frontend & backend 🔄
- Ideal for APIs, real-time apps, microservices 💬
3️⃣ Core Concepts:
- Modules: Reusable code blocks (e.g., fs, http, custom modules) 🧩
- Event Loop: Handles async operations ⏳
- Callbacks & Promises: For non-blocking code 🤝
4️⃣ Basic Server Example:
const http = require('http');
http.createServer((req, res) => {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello, Node.js!');
}).listen(3000); // Server listening on port 3000
5️⃣ npm (Node Package Manager):
Install libraries like Express, Axios, etc.
npm init
npm install express
6️⃣ Express.js (Popular Framework):
const express = require('express');
const app = express();
app.get('/', (req, res) => res.send('Hello World!'));
app.listen(3000, () => console.log('Server running on port 3000'));
7️⃣ Working with JSON & APIs:
app.use(express.json()); // Middleware to parse JSON body
app.post('/data', (req, res) => {
console.log(req.body); // Access JSON data from request body
res.send('Received!');
});
8️⃣ File System Module (fs):
const fs = require('fs');
fs.readFile('file.txt', 'utf8', (err, data) => {
if (err) throw err;
console.log(data); // Content of file.txt
});
9️⃣ Middleware in Express:
Functions that run before reaching the route handler.
app.use((req, res, next) => {
console.log('Request received at:', new Date());
next(); // Pass control to the next middleware/route handler
});
🔟 Real-World Use Cases:
- REST APIs 📊
- Real-time apps (chat, notifications) 💬
- Microservices 🏗️
- Backend for web/mobile apps 📱
💡 Tip: Once you're confident, explore MongoDB, JWT auth, and deployment with platforms like Vercel or Render.
💬 Tap ❤️ for more!
❤4