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. In this tutorial, you'll learn about JavaScript variables and how to use variables to store values in the application. Feb 25, 2026 · The var keyword is almost the same as let. It also declares a variable but in a slightly different, “old-school” way. There are subtle differences between let and var, but they do not matter to us yet. We’ll cover them in detail in the chapter The old "var".
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