The main property of the function is to return a value.

The space of the function is deleted after its execution, and you will very rarely output information to the console through the function.

With the help of the `return` keyword, the value return operation will be performed, and the function will finish its execution:

function add(a, b) {
  return a + b;
};

let sum = add(25, 30);

console.log("sum =", sum);

You can see above that function calling (`add(25, 30)`) was replaced by the literal `55` (25 + 30), which was after the `return` keyword.

> Note
>
> The function has completed its execution and returns a value that becomes a literal at the point of call, and the function space disappears.

It is also necessary to understand that the keyword `return` ends the execution of the function. All the code after the `return` will not be executed:

function add(a, b) {
  return a + b;
  console.log("Two numbers added");
  console.log("Two numbers added");
  console.log("Two numbers added");
  console.log("Two numbers added");
};

let numb = add(25, 12);

console.log("numb =", numb);

You can see that the `console.log()` operations were not executed.

First, let's get acquainted with JavaScript and look at its syntax. In this section, you will get a basic familiarity with the JavaScript syntax to make it easier to learn in detail later on.

Now it's time to learn about the data types that JavaScript works with. We'll start by looking at the difference between literals and variables, and then delve into the various data types.

We have become familiar with the various data types. Now, let's learn how to work with them by learning the operations we can perform with each data type.

Next, we will learn how to control the flow of execution. It's a straightforward process: we can tell the interpreter exactly what to do under certain conditions.

Next, we will explore how to shorten code using repetitive looped actions. We will examine the types of loops available in JavaScript and learn how to work with them.

Finally, to be able to write simple programs, we need to learn about functions that can make our lives much easier. We will learn how to create and use our functions.