The standard way of introducing enumerations in Go is to declare a custom type
and a const group with iota. Since variables have a 0 default value, you
should usually start your enums on a non-zero value.
| Bad | Good |
|---|---|
type Operation int
const (
Add Operation = iota
Subtract
Multiply
)
// Add=0, Subtract=1, Multiply=2 |
type Operation int
const (
Add Operation = iota + 1
Subtract
Multiply
)
// Add=1, Subtract=2, Multiply=3 |
There are cases where using the zero value makes sense, for example when the zero value case is the desirable default behavior.
type LogOutput int
const (
LogToStdout LogOutput = iota
LogToFile
LogToRemote
)
// LogToStdout=0, LogToFile=1, LogToRemote=2