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Go: Design Patterns for Real-World Projects by Mat Ryer, Mario Castro Contreras, Vladimir Vivien

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Factory method - delegating the creation of different types of payments

The Factory method pattern (or simply, Factory) is probably the second-best known and used design pattern in the industry. Its purpose is to abstract the user from the knowledge of the struct he needs to achieve for a specific purpose, such as retrieving some value, maybe from a web service or a database. The user only needs an interface that provides him this value. By delegating this decision to a Factory, this Factory can provide an interface that fits the user needs. It also eases the process of downgrading or upgrading of the implementation of the underlying type if needed.

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When using the Factory method design pattern, we gain an extra layer of encapsulation ...

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