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by sa46
1464 days ago
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The upside of structural typing, with some help from Go idioms, is that it encourages composition and narrow types. A type like bytes.Buffer implements Reader, Writer, ByteWriter, ByteReader and another 5 or so interfaces but the call site can declare which set of methods it needs. The downside of nominal interfaces seems worse: you have to import the interface which can lead to awkward situations like cyclic dependencies and type-only packages (a la Haskell). In practice, the extra friction of nominal interfaces also seems to encourage wide interfaces in contrast to Go's narrow interfaces. |
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