Web Reference: A JavaScript variable is a container for storing data, while a constant is a variable whose value cannot be changed. In this tutorial, you will learn about JavaScript variables and constants with the help of examples. Declaring JavaScript Variables Creating a variable in JavaScript is called declaring a variable. You declare a JavaScript variable with the let keyword or the const keyword. Mar 13, 2026 · A variable is like a container that holds data that can be reused or updated later in the program. In JavaScript, variables are declared using the keywords var, let, or const.
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