August 2018
Intermediate to advanced
248 pages
5h 51m
English
Content preview from Mastering Python Design Patterns - Second Edition
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Use cases
The prototype pattern is useful when we have an existing object that needs to stay untouched, and we want to create an exact copy of it, allowing changes in some parts of the copy.
There is also the frequent need for duplicating an object that is populated from a database and has references to other database-based objects. It is costly (multiple queries to a database) to clone such a complex object, so a prototype is a convenient way to solve the problem.