Methods

Methods are functions that have a receiver (see ).You can define methods on any type (except on non-local types, this includesbuilt-in types: the type int can not have methods).You can however make a new integer type with its own methods. For example:

type Foo int
func (self Foo) Emit() {
    fmt.Printf("%v", self)
}
type Emitter interface {
    Emit()
}

Doing this on non-local (types defined in other packages) types yields an error“cannot define new methods on non-local type int”.