Summary  
This chapter covers declaring variables to store numeric and text values, performing operations on them, and printing results, illustrating JavaScript’s line-by-line execution model.

General domain of usage  
Web development

Now that you can run JavaScript on your computer, it's time to write simple code.

JavaScript allows you to store values and perform operations with them.

For example:

const a = 5;
const b = 3;

const sum = a + b;

console.log(sum);

Here, values are stored in variables. Then a calculation is performed, and the result is printed to the console.

You can also work with text:

JavaScript executes code line by line. Each instruction runs in order, and you can use `console.log` to see the result at any step.

This is the foundation of programming: storing data, processing it, and producing an output.

Learn the core concepts of JavaScript needed for backend development, including variables, data structures, functions, and asynchronous code. Practice working with real data and understand how JavaScript behaves outside the browser. Build a strong foundation before moving on to Node.js and server-side development.

Writing Your First JavaScript Code