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JavaScript Objects represent self contained entities consisting of variables (called ''properties'' in object terminology) and functions (called ''methods'') that can be used to perform tasks and store complex data. JavaScript objects fall into three categories - : Built-in Objects, Custom Objects and Document Object Model (DOM) Objects.
Built-in objects are objects that are provided with JavaScript to make your life as a JavaScript developer easier. In many of the examples given in this book we have used the document.write() mechanism to write text to the current web page. Whether you knew it or not, you have been using the write() method of the JavaScript built-in document ''object'' when you have run these scripts.
