Fortunately, JavaScript’s variable system is incredibly powerful and versatile. This article shows you how to use JavaScript variables to store numbers, text strings, objects, and other data types.

As with almost every programming language, JavaScript treats various types of values differently. A string like “Hello world” is very different from a number like 42.

A new JavaScript API will be available to preview inside Excel later this month, which will let developers create these custom data types for inputs and outputs and enable custom functions. Excel ...