Go interface

Interface

To implement an interface in Go, we just need to implement all the methods in the interface.

Sample

This samples covers

• blank interface
• prepare interface
• implement in struct

package main

import (
	"fmt"
	"reflect"
)

type InterfaceSample interface{}

type InterfaceZ interface {
	setValue(v int)
	getValue() int
}

type InterfaceImpl struct {
	Value int
	Name  string
}

func (i *InterfaceImpl) setValue(v int) {
	i.Value = v
}

func (i *InterfaceImpl) getValue() int {
	return i.Value
}

func main() {
	var i1 InterfaceZ
	fmt.Println(i1)
	i1 = new(InterfaceImpl)
	fmt.Println(i1)
	i1.setValue(3)
	fmt.Println(i1.getValue())
	// NO i1.Name = ""

	// Blank Interface
	var i2 InterfaceSample
	fmt.Println(i2)
	i2 = 3
	fmt.Println(i2)

	i2 = new(InterfaceImpl)
	fmt.Println(i2)
	fmt.Println(reflect.TypeOf(i2))
}

blank interface is powerful, can insert anything.