Interfaces in Go 관련

The Go Handbook – Learn Golang for Beginners

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Golang is an awesome, simple, modern, and fast programming language. It’s compiled, open source, and strongly typed. Golang – also called Go – was created by Google engineers with these main goals: make their projects compile (and run) faster be sim...

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The Go Handbook – Learn Golang for Beginners

Golang is an awesome, simple, modern, and fast programming language. It’s compiled, open source, and strongly typed. Golang – also called Go – was created by Google engineers with these main goals: make their projects compile (and run) faster be sim...

An interface is a type that defines one or more method signatures.

Methods are not implemented, just their signature: the name, parameter types and return value type.

Something like this:

type Speaker interface {
    Speak()
}

Now you could have a function accept any type that implements all the methods defined by the interface:

func SaySomething(s Speaker) {
    s.Speak()
}

And we can pass it any struct that implements those methods:

type Speaker interface {
    Speak()
}

type Person struct {
    Name string
    Age int
}

func (p Person) Speak() {
    fmt.Println("Hello from " + p.Name)
}

func SaySomething(s Speaker) {
    s.Speak()
}

func main() {
    flavio := Person{Age: 39, Name: "Flavio"}
    SaySomething(flavio)
}