Knowing how to work with JavaScript variables is a must for every web and JavaScript developer. In this tutorial, you will learn the basics, how to declare, initialize and re-assign JavaScript variables and how to use var, let and const. You will also learn about scope.

Introduction to JavaScript variables

Similarly to many other programming languages, JavaScript also has variables. An easy way to think about variables is to think about them as storage containers. Each of these containers has a name, a variable name. You can use these containers to store various types of data, such as numbers, strings, objects, arrays, etc.

The best thing is that you can use the data they are storing later. When you want to use these data later you do it by using the name of some specific container, or variable. This is also called referencing a variable. When you reference a variable, use its name, JavaScript will return the value is assigned to that variable, data stored in that container.

Variable declaration, initialization and re-assignment

One thing before we take a look at the types of JavaScript variables you can use. We should briefly talk about declaration and initialization. When it comes to JavaScript variables, or variables in general, you will encounter these two terms very often. What these terms, declaration and initialization, actually mean?

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