Arrow Functions

Arrow Functions

Arrow functions are a shorter syntax for writing functions:

// Traditional function
function double(n) {
    return n * 2;
}

// Arrow function — same behavior, shorter syntax
const double = (n) => n * 2;

// Single parameter — parentheses optional
const double = n => n * 2;

// Multiple parameters — parentheses required
const add = (a, b) => a + b;

When the body is a single expression, the result is returned automatically. No return keyword needed.

Multi-line Arrow Functions

For more complex logic, use curly braces with an explicit return:

const factorial = (n) => {
    let result = 1;
    for (let i = 2; i <= n; i++) result *= i;
    return result;
};

Arrow Functions as Arguments

Arrow functions shine when passed as arguments to other functions:

const numbers = [1, 2, 3, 4, 5];
const squares = numbers.map(n => n * n);
console.log(squares);  // [1, 4, 9, 16, 25]

Your Task

Write two arrow functions:

• const double — takes a number, returns double
• const square — takes a number, returns its square

Then print double(7) and square(6).