Go mappable interface

mappable.go

package main

import (
	"fmt"
	"github.com/golang/protobuf/proto"
)

type Mapable interface{
	Map(interface{}) Mapable
}

type IntSlice []int

func (i IntSlice) Map(fn interface{}) Mapable {
	data := make(IntSlice,0)
	v,_ := fn.(func(int) int)
	for _, value := range i{
		data = append(data, v(value))
	}
	return data
}

type Ztring string
func (s Ztring) Map(fn interface{}) Mapable {
	var data Ztring
	v, _ := fn.(func(Ztring) Ztring)
	for _, value := range s{
		data += v(Ztring(value))
	}
	return data
}
func main() {
	fmt.Println("Let's get dangerous")
	fmt.Printf("SSS %s\n\n", proto.String("hello"))
	// animals := []Animal{ Dog{}, Human{}, Bird{}}
	// for _, animal := range animals {
	// 	fmt.Println(animal.Walk())
	// }
	i := IntSlice{10, 20, 30}
	result := i.Map(func(value int) int{
		return value * 123
	})
	fmt.Println(result)

	var s Ztring = "hello"
	result2 := s.Map(func(i Ztring) Ztring{
		return "["+i+"]"
	})
	fmt.Println("result=", result2)
}