November 2019
Beginner to intermediate
674 pages
15h
English
Content preview from Mastering Delphi Programming: A Complete Reference Guide
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Factory method
The factory method pattern specifies how an object can defer creation of some internal data and leave the actual task of creation for the derived class. It is part of the original Gang of Four book.
Imagine a kid making cookies out of dough. They can do nothing until they invoke the factory method and say, Give me a cutter. So, you provide them with a cookie cutter (the result of the factory method), and they can finally start making cookies.
By implementing this approach, you can be flexible and select the appropriate cookie shape for the occasion. Output from the factory method therefore changes the final result.
The functionality of this pattern, as described in the original Design Patterns publication, looks very similar ...
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