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The Go Programming Language by Brian W. Kernighan, Alan A. A. Donovan

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6.6 Encapsulation

A variable or method of an object is said to be encapsulated if it is inaccessible to clients of the object. Encapsulation, sometimes called information hiding, is a key aspect of object-oriented programming.

Go has only one mechanism to control the visibility of names: capitalized identifiers are exported from the package in which they are defined, and uncapitalized names are not. The same mechanism that limits access to members of a package also limits access to the fields of a struct or the methods of a type. As a consequence, to encapsulate an object, we must make it a struct.

That’s the reason the IntSet type from the previous section was declared as a struct type even though it has only a single field:

type ...

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