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

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Summary

In this chapter, we added three different implementations of profile pictures to our chat application. First, we asked the auth service to provide a URL for us to use. We did this using Gomniauth's abstraction of the user resource data, which we then included as part of the user interface every time a user would send a message. Using Go's zero (or default) initialization, we were able to refer to different implementations of our Avatar interface without actually creating any instances.

We stored data in a cookie for when the user would log in. Given the fact that cookies persist between builds of our code, we added a handy logout feature to help us validate our changes, which we also exposed to our users so that they could log out too. ...

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