Types
The language predeclares certain type names. Others are introduced with type declarations or type parameter lists. Composite types—array, struct, pointer, function, interface, slice, map, and channel types—may be constructed using type literals.
Type declarations, type parameter lists, and type aliases are coming up later, so today we’re focused on the predeclared types.
The list of predclared types would appear near the beginning of most intro to Go books (I would know, I just read and reviewed 11 of them!). In the Go spec, they appear about a third of the way through. So we’re jumping ahead to enumerate them. These are all of the predeclared, or “basic” types in Go.
| Type Name | Description |
|---|---|
any |
Alias for interface{}, the empty interface |
bool |
Boolean, possible values are true and false |
byte |
Alias for uint8 |
comparable |
Denotes all non-interface types that are strictly comparable |
complex64 |
A 64-bit complex number |
complex128 |
A 128-bit complex number |
error |
Interface type used to report errors |
float32 |
32-bit floating point number |
float64 |
64-bit floating point number |
int |
A 32- or 64-bit signed integer* |
int8 |
An 8-bit signed integer |
int16 |
A 16-bit signed integer |
int32 |
A 32-bit signed integer |
int64 |
A 64-bit signed integer |
rune |
Alias for int32, A Unicode codepoint |
string |
A string of Unicode characters |
uint |
A 32- or 64-bit unsigned integer* |
uint8 |
An 8-bit unsigned integer |
uint16 |
A 16-bit unsigned integer |
uint32 |
A 32-bit unsigned integer |
uint64 |
A 64-bit unsigned integer |
uintptr |
An unsigned integer large enough for a pointer value* |
* The size of these types is architecture-dependent.
Quotes from The Go Programming Language Specification, Version of January 19, 2023
