Introduction to JavaScript Functions

Functions are reusable blocks of code that perform a specific task.

Step 1: Defining a Function

In JavaScript, you can define a function using the function keyword.

function greet(name) {
    console.log(`Hello, ${name}!`);
}

Step 2: Calling a Function

To use a function, you need to call it by its name, followed by parentheses containing any arguments.

function add(x, y) {
    return x + y;
}
let result = add(5, 10);
console.log(result);

Step 3: Working with Function Arguments

Functions can take any number of arguments, which are passed to the function when it's called.

function calculateArea(length, width) {
    return length * width;
}
let area = calculateArea(10, 20);
console.log(area);

By following these steps, you can create and use reusable functions in JavaScript.