| 1 | // Modern JavaScript example |
| 2 | class Calculator { |
| 3 | constructor() { |
| 4 | this.result = 0; |
| 5 | } |
| 6 | |
| 7 | add(a, b) { |
| 8 | this.result = a + b; |
| 9 | return this.result; |
| 10 | } |
| 11 | |
| 12 | multiply(a, b) { |
| 13 | return a * b; |
| 14 | } |
| 15 | } |
| 16 | |
| 17 | // Arrow function |
| 18 | const fibonacci = (n) => { |
| 19 | if (n <= 1) return n; |
| 20 | return fibonacci(n - 1) + fibonacci(n - 2); |
| 21 | }; |
| 22 | |
| 23 | // Async/await example |
| 24 | async function fetchData(url) { |
| 25 | try { |
| 26 | const response = await fetch(url); |
| 27 | const data = await response.json(); |
| 28 | return data; |
| 29 | } catch (error) { |
| 30 | console.error("Error:", error); |
| 31 | } |
| 32 | } |
| 33 | |
| 34 | // Main execution |
| 35 | const calc = new Calculator(); |
| 36 | console.log(`5 + 3 = ${calc.add(5, 3)}`); |
| 37 | |
| 38 | // Array methods |
| 39 | const numbers = [1, 2, 3, 4, 5]; |
| 40 | const doubled = numbers.map(x => x * 2); |
| 41 | const evens = numbers.filter(x => x % 2 === 0); |
| 42 | |
| 43 | // Object destructuring |
| 44 | const { result } = calc; |
| 45 | console.log("Result:", result); |
| 46 | |
| 47 | // Template literals and promises |
| 48 | Promise.resolve("Hello") |
| 49 | .then(msg => `${msg}, World!`) |
| 50 | .then(console.log); |