Variables and Data Types

Variables and data types are foundational to programming in JavaScript. Variables allow us to store and manipulate data, while data types define the nature of the data we can work with, such as numbers, strings, and booleans. In this lesson, we will explore how to declare variables in JavaScript using different keywords and understand the characteristics of various primitive data types.

Variables in JavaScript

In JavaScript, variables store data values. We declare them using var, let, or const.

The var keyword

var is function-scoped and can be redeclared or updated, which may lead to bugs.