const add = (a, b) => a + b;
console.log("Addition:", add(5, 3)); 


const greet = () => "Hello, World!";
console.log("Greeting:", greet()); 


const square = x => x * x;
console.log("Square of 4:", square(4)); 


const isEven = num => num % 2 === 0;
console.log("Is 10 even?:", isEven(10)); 


const numbers = [1, 2, 3, 4];
const doubled = numbers.map(num => num * 2);
console.log("Doubled Numbers:", doubled); 


const evenNumbers = numbers.filter(num => num % 2 === 0);
console.log("Even Numbers:", evenNumbers);