Using functions is an important part of programming. Functions are chunks of code that can be called upon to perform specific actions when needed. This makes the code modular and easy to read. Here are some examples of using functions in JavaScript:

In this example, a function named "tervehdi" is defined. The function takes one parameter, "nimi". The purpose of the function is to print a greeting message to the console, using the given name. When the function is called with the parameter "Matti", the console will print "Hello Matti!".

. The purpose of the function is to calculate the sum of these parameters and return it to the user. When the function is called with parameters 3 and 5, it returns 8, which is stored in the variable summa. This variable is then printed to the console, displaying "8".

The possibilities for using functions are limitless, and they can be used in many different ways to solve various problems. With them, the code can be easily readable and maintainable when tasks are divided into different functions that can be used when needed.

Using functions is an important part of programming. Functions are chunks of code that can be called upon to perform specific actions when needed. This makes the code modular and easy to read. Here are some examples of using functions in JavaScript:

## Example 1:

```javascript
// Defining the function
function greet(name) {
  console.log("Hello " + name + "!");
}

// Calling the function
greet("Matt"); // print "Hey Matt!"
```

In this example, a function named "tervehdi" is defined. The function takes one parameter, "nimi". The purpose of the function is to print a greeting message to the console, using the given name. When the function is called with the parameter "Matti", the console will print "Hello Matti!".

---

## 
Example 2

```javascript
// Defining the function
function calculateTotal(a, b) {
  return a + b;
}

// Calling the function
var sum = countTotal(3, 5);
console.log(sum); // prints 8
```

In this example, a function **laskeYhteen** is defined, which takes two parameters **a** and **b**. The purpose of the function is to calculate the sum of these parameters and return it to the user. When the function is called with parameters 3 and 5, it returns 8, which is stored in the variable summa. This variable is then printed to the console, displaying "8".

The possibilities for using functions are limitless, and they can be used in many different ways to solve various problems. With them, the code can be easily readable and maintainable when tasks are divided into different functions that can be used when needed.

---

## Practice

@embed d508a0581b89


JavaScript Functions

This course is an introduction to web development and focuses on the basics of HTML, CSS, JavaScript and backend systems. The aim of the course is to provide students with the necessary skills and knowledge to design, develop and understand simple web applications.

This course is an introduction to web development and focuses on the basics of building websites, namely HTML, CSS, JavaScript, and fundamentals of backend systems. The goal of the course is to provide you with the necessary skills and knowledge to design and develop simple full-stack web applications, as well as understand web applications made by others.

In the first part, HTML is studied, which is a markup language used in building websites.


The second part covers the basics of CSS, such as the use of style sheets, rules, selectors, and formatting. It also covers advanced features of CSS, such as animations and responsive design.

In the third part, we will study JavaScript, which is currently an incredibly important tool in both frontend and backend development, and thus also in cybersecurity and ethical hacking.

In the final part, we will learn how to build back-end systems using the Python Flask framework. You will learn the basics of back-end systems, such as using databases, authentication, session management, and access control.

You can do the course exercises on your own computer if you want, but each code example has a button that allows you to directly run the code in the browser and see what the page looks like or what the script prints. So you do not need to install anything, but you can if you want.

It is recommended but optional to create an account on replit.com service. In that case, you can just click "Fork" on the code examples to make a copy for yourself to play with

JavaScript Functions

Example 1:

Learn to hack — start here