以下摘自The Go Programming Language：
Go’s types fall into four categories: basic types, aggregate types, reference types, and interface types. Basic types, include numbers, strings, and booleans. Aggregate types—arrays and structs —form more complicated data types by combining values of several simpler ones. Reference types are a diverse group that includes pointers, slices, maps, functions, and channels, but what they have in common is that they all refer to program variables or state indirectly, so that the effect of an operation applied to one reference is observed by all copies of that reference.