June 2016
Beginner to intermediate
292 pages
6h 8m
English
Content preview from Mastering JavaScript Object-Oriented ProgrammingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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An object factory
In some contexts, we need to create different types of objects, but we wish to manage their creation in a uniform way. Consider, for example, a word processor that need to allow the user to add elements to a document: words, paragraphs, images, sections, and so on. Each type of object will match a class or constructor that will create the required object and will put it on the document. This means that the document manager needs to know how to create each type of object. Moreover, when a new type of element is added to the word processor's capability, say tables, the document manager must be modified in order to learn how to create these new elements.
In these cases, the factory pattern can help us set up a more effective approach. ...
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