Web Reference: 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. Aug 19, 2024 · There are three main reference data types that you'll mostly come across in your journey as a JavaScript developer: Object, Array, and Function. Let's look into them one after the other.
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