Arrow Functions

A shorter function syntax

Arrow functions are a more concise way to write functions — especially useful for short ones:

// Regular function
function square(x) {
  return x * x
}

// Arrow function — same result
const square = (x) => {
  return x * x
}

// Even shorter: when the body is a single expression, return is implicit
const square = (x) => x * x

console.log(square(5))  // 25

When to use which?

• Short conversions or calculations → arrow function
• Methods on objects → regular function
• Everything else → personal preference

Your task

Write three arrow functions:

1. double(x) → returns x × 2
2. isEven(n) → returns true if n is even
3. greet(name) → returns "Hey, [name]!"