Go for Guides and Interfaces Is an Advanced Case, Johnny.

interfaces is one of those things that people really struggle with coming to Go. I do expose a decent amount of interfaces, but I also write a lot of local, unexplored interfaces inside of another function or something. Just inline because I want to check, does it have this method on it? And if so, I don't need some big interfaces. Somewhere else, I can just do it right there in line. One downside to that technique is you can hide things inside the function.

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