``` // This is a comment // Declare a variable let name = 'John Doe'; // Conditional statement if (name === 'John Doe') { console.log('Hello, John!'); } else { console.log('Hello, unknown!'); } // Function function greet(name) { console.log(`Hello, ${name}!`); } // Call the function greet('Jane Doe'); // Array let fruits = ['apple', 'banana', 'cherry']; // Object let person = { name: 'John Doe', age: 30, occupation: 'Developer' }; // DOM manipulation (front-end) let heading = document.querySelector('h1'); heading.innerHTML = 'New heading text!'; ```