October 2015
Beginner to intermediate
400 pages
14h 44m
English
Content preview from The Go Programming LanguageBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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7.15 A Few Words of Advice
When designing a new package, novice Go programmers often start by creating a set of interfaces and only later define the concrete types that satisfy them. This approach results in many interfaces, each of which has only a single implementation. Don’t do that. Such interfaces are unnecessary abstractions; they also have a run-time cost. You can restrict which methods of a type or fields of a struct are visible outside a package using the export mechanism (§6.6). Interfaces are only needed when there are two or more concrete types that must be dealt with in a uniform way.
We make an exception to this rule when an interface is satisfied by a single concrete type but that type cannot live in the same package as the ...
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