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<td>function<td>any user defined function<td>A function is one of the basic building blocks of most programming languages including JavaScript. Functions are used to break up a script into clean, reusable modules. Functions are covered in a later chapter.</td>
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<td>object<td>document, window<td>JavaScript provides a set of predefined objects to which the JavaScript programmer has access. For example the ''document'' object refers to the current web page and can be accessed to make changes to the page content.
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