This article shows you how to use JavaScript variables to store numbers, text strings, objects, and other data types. Once you’ve stored this information, you can use it anywhere in your program.

First, it’s important to note that JavaScript’s values have fixed types, but variables do not. A JavaScript variable is dynamically typed, so it adopts whatever the type of its value is: ...

Scope in JavaScript refers to context (or portion) of the code which determines the accessibility (visibility) of variables. In JavaScript, we have two types of scope, local , and global.

Survey your options for in-browser data storage with JavaScript, including built-in variables, localStorage, IndexedDB, and the service worker cache API.

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 ...