This chapter introduces the two most fundamental data types in JavaScript: numbers and strings. We will introduce their underlying representations, and functions used to work with and perform calculations on them.

JavaScript does not have a date data type. However, you can use the Date object and its methods to work with dates and times in your applications. The Date object has a large number of methods for setting, getting, and manipulating dates. It does not have any properties.

Regular expressions are patterns used to match character combinations in strings. In JavaScript, regular expressions are also objects. These patterns are used with the exec() and test() methods of RegExp, and with the match(), matchAll(), replace(), replaceAll(), search(), and split() methods of String. This chapter describes JavaScript regular expressions. It provides a brief overview of each syntax element. For a detailed explanation of each one's semantics, read the regular expressions reference.

The Intl object is the namespace for the ECMAScript Internationalization API, which provides a wide range of locale- and culture-sensitive data and operations.

Patterns are arguably one of the more confusing fill types to use in SVG. They're also very powerful, so they're worth talking about and getting at least a fundamental grasp on. Like gradients, the <pattern> element should be put in the <defs> section of your SVG file.

The <set> SVG element provides a method of setting the value of an attribute for a specified duration.

The target attribute on the SVG <a> element doesn't work in Mozilla Firefox 1.5. When SVG documents are embedded within a parent HTML document using the tag:

The Set object lets you store unique values of any type, whether primitive values or object references.

SVG makes use of a number of data types. This article lists these types along with their syntax and descriptions of what they're used for.

Number values represent floating-point numbers like 37 or -9.25.