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. Jul 8, 2025 · Many style guides (including MDN's) recommend using const over let whenever a variable is not reassigned in its scope. This makes the intent clear that a variable's type (or value, in the case of a primitive) can never change. Others may prefer let for non-primitives that are mutated.
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