Interfaces 101 : Interface Type Assertion

Episode 6! - Watch and learn how you can use type assertions to write simple, yet effective, code. -- In this video, Miki will write a versatile logging library with Go interfaces.The first prototype he proposes consists of a type with an `io.Writer` interface field to handle writing data for the logger. Upon completing the first design, Miki realizes his type is missing a `Sync` function, which will enable developers to move data into stable storage while logging. To meet this requirement, Miki will create a new interface type with a `Sync` function.

Things you will learn in this video :
- How to properly perform a type assertion on an interface.
- How to move data from memory to stable storage.
- Tips on designing an interface in Go.

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Do you agree with the Go proverb : “the bigger the interface the weaker the abstraction”?
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[amerispunk]

Miki, what I don't understand is that with the s field being a NopSyncer empty struct, Sync() will always be a no-op. Nothing is being wrapped in this Sync(), so what does this accomplish? I don't see how any file sync would happen this way. Am I missing something?

[nkodoko]

Cool use of interfaces to make sensible logic