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Chapter 9. JavaScript Core Objects > What Are Core Objects?

9.1. What Are Core Objects?

Like an apple, JavaScript has a core, and at its core are objects. Everything you do in JavaScript will be based on objects; you may create your own or use JavaScript's core objects, those objects built right into the language. JavaScript provides built-in objects that deal with date and time, math, strings, regular expressions, numbers, and other useful entities. The good news is that the core objects are consistent across different implementations and platforms and have been standardized by the ECMAScript 1.0 specification, allowing programs to be portable. Although each object has a set of properties and methods that further define it, this book does not detail every one, but highlights those that will be used most often. For a complete list of properties and objects, see the CD-ROM in the back of this book or go to http://developer.netscape.com.


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