Beside the basic types, there are others, which are known as composite types. These are as follows:
| Type | Description | Example |
| Pointer | The address in the memory of a variable | *int |
| Array | A container of the element of the same type with a fixed length | [2]int |
| Slice | Contiguous segment of an array | []int |
| Map | Dictionary or associative array | map[int]int |
| Struct | A collection of fields that can have different types | struct{ value int } |
| Function | A set of functions with the same parameters and output | func(int, int) int |
| Channel | Type pipes that are used for the communication of elements of the same type | chan int |
| Interface | A specific collection of methods, with an underlying value that supports them | interface{} |
The empty interface, interface{}, is a generic type that can contain any value. Since this interface has no requirements (methods), it can be satisfied by any value.
Interfaces, pointers, slices, functions, channels, and maps can have a void value, which is represented in Go by nil:
- Pointers are self-explanatory; they are not referring to any variable address.
- The interface's underlying value can be empty.
- Other pointer types, like slices or channels, can be empty.