JavaScript Typing Unlike strongly typed programming languages such as C#, JavaScript is loosely typed and allows you to assign any data type to a variable without giving the variable a specific type.

JavaScript variables hold a wide variety of information and can be used with virtually any data type. Here's how to use variables to store numbers, text strings, objects, and more.

To enable JavaScript, go into the Settings app on your iPhone, click "Safari," then "Advanced," and swipe the JavaScript button to the right so it appears green. Here's a full breakdown with pictures.