function App() {
  return <h1>Hello React</h1>;
}

const name = "Deepak";
return <h1>Hello {name}</h1>;

my-app/
├── node_modules/
├── public/
├── src/
│ ├── App.js
│ ├── index.js
│ ├── components/
│ └── styles/
├── package.json

function App() {
  return <h1>My name is Deepak</h1>;
}
export default App;

function App() {
  const name = "Deepak";
  return <h1>Hello {name}</h1>;
}
export default App;

src/
├── App.js
├── index.js
└── components/
    └── Header.js

function Header() {
  return <h2>Welcome to My Website</h2>;
}
export default Header;

import Header from "./components/Header";

function App() {
  return (
    <div>
      <Header />
      <h1>Hello React</h1>
    </div>
  );
}
export default App;

let num = 10;
if (num % 2 === 0) {
  console.log("Even");
} else {
  console.log("Odd");
}

let text = "hello";
let reversedText = text.split("").reverse().join("");
console.log(reversedText);  // Output: olleh

function factorial(n) {
  let result = 1;
  for (let i = 1; i <= n; i++) {
    result *= i;
  }
  return result;
}
console.log(factorial(5));  // Output: 120

let items = [1, 2, 2, 3, 4, 4];
let uniqueItems = [...new Set(items)];
console.log(uniqueItems);

for (let i = 1; i <= 10; i++) {
  console.log(i);
}

let word = "madam";
let reversed = word.split("").reverse().join("");
if (word === reversed) {
  console.log("Palindrome");
} else {
  console.log("Not a palindrome");
}

SELECT MAX(salary)  
FROM employees  
WHERE salary < (SELECT MAX(salary) FROM employees);

SELECT department, COUNT(*)  
FROM employees  
GROUP BY department;

SELECT email, COUNT(*)  
FROM users  
GROUP BY email  
HAVING COUNT(*) > 1;

SELECT c.name, o.order_date  
FROM customers c  
JOIN orders o ON c.id = o.customer_id;

SELECT DISTINCT salary  
FROM employees  
ORDER BY salary DESC  
LIMIT 3;

SELECT * FROM logins  
ORDER BY login_time DESC  
LIMIT 5;

SELECT name  
FROM employees  
WHERE manager_id IS NULL;

SELECT * FROM employees  
WHERE name LIKE 'S%';

SELECT MONTH(order_date) AS month, SUM(amount)  
FROM sales  
GROUP BY MONTH(order_date);

DELETE FROM users  
WHERE last_active < '2023-01-01';

const express = require("express");
const app = express();
app.get("/", (req, res) => {
  res.send("Hello Backend");
});
app.listen(3000, () => {
  console.log("Server running on port 3000");
});

npm init -y
npm install express

const express = require("express");
const app = express();

// Home route
app.get("/", (req, res) => {
  res.send("Welcome to my server");
});

// About route
app.get("/about", (req, res) => {
  res.send("This is About Page");
});

// API route returning JSON
app.get("/api/user", (req, res) => {
  res.json({ name: "Deepak", role: "Developer", age: 25 });
});

// Start server
app.listen(3000, () => {
  console.log("Server running on http://localhost:3000");
});

node server.js

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