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BOOK: Professional JavaScript for Web Developers ISBN: 978-0-7645-7908-0
This is the forum to discuss the Wrox book Professional JavaScript for Web Developers by Nicholas C. Zakas; ISBN: 9780764579080
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Old August 17th, 2006, 08:32 AM
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Default Need help with inheritance

Hi!

On page 108, you write "this.newMethod = ClassA;"

However, on page 109, you write "ClassB.prototype = new ClassA();"

Could you please explain why you have the new keyword in the second case, and no new keyword in the first place.

Please help help help

Thanks :)

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Old August 25th, 2006, 09:38 PM
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Filip,

The "new" operator is used to instantiate an instance of an object. So "new ClassA()" creates a new object of the type ClassA. Without "new", ClassA is just a pointer to a function.

Nicholas C. Zakas
Author, Professional JavaScript for Web Developers (ISBN 0764579088)
http://www.nczonline.net/
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