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1136 Part IV . JavaScript Core Language Reference Listing 42-2 (continued) if (count > 2) { break } } return dataArray.join( , ) } var book = {title: The Aeneid , author: Virgil , pageCount:543} book.toString = customToString A user-defined toString() result:

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When you run Listing 42-2, you can see how the customobject s toString() handler extracts the values of all elements of the object except for the last one, which is the function handler reference. You can customize how the data should be labeled and/or formatted. unwatch(property) watch(property, handler) Returns: Nothing. NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility . To supply the right kind of information to external debuggers, JavaScript in NN4+ implements two global functions that belong to every object including user- defined objects. The watch() function keeps an eye on a desired object and property. If that property is set by assignment, the function invokes another user-defined function that receives information about the property name, its old value, and its new value. The unwatch()function turns off the watch functionality for a particular property. See Listing 41-7 in Chapter 41 for an example of how to use these functions that you can assign to any object. unwatch()
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