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bookInterfaces in Go

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You will explore interfaces in Go. You will learn how to define interfaces, how Go's implicit implementation model works, and how interface values behave at runtime.

Defining Interfaces in Go

In Go, an interface is a type that specifies a set of method signatures. Any type that implements those methods satisfies the interface automatically—there is no need for explicit declaration. This enables you to write flexible and reusable code.

To define an interface, use the type keyword followed by the interface name and the interface keyword. Inside the curly braces, list the method signatures required by the interface.

Here is a simple example:

type Greeter interface {
    Greet() string
}

This code declares a Greeter interface that requires any type to have a Greet method returning a string. Any type with a matching Greet method will satisfy the Greeter interface.

main.go

main.go

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package main

import (
    "fmt"
)

// Speaker defines an interface with a single method
 type Speaker interface {
    Speak() string
}

// Dog struct implicitly implements the Speaker interface
 type Dog struct {
    Name string
}

// Speak method matches the Speaker interface
func (d Dog) Speak() string {
    return "Woof! My name is " + d.Name
}

func main() {
    var s Speaker
    s = Dog{Name: "Buddy"}
    fmt.Println(s.Speak())
}
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How does a type implement an interface in Go?

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