go reverse

reverse.go

package main

import (
	"fmt"
	"reflect"
)

func reverse(slice interface{}) interface{} {
/* Completely inefficient but syntactically "convenient" */
	s := reflect.ValueOf(slice)
	switch s.Kind() {
	case reflect.String:
		/* Support proper rune stuff, but terribly */
		ret := ""
		for _, v := range slice.(string) {
			ret = string(v) + ret
		}
		return ret
	case reflect.Slice, reflect.Array:
		ret := reflect.MakeSlice(reflect.TypeOf(slice), s.Len(), s.Len())
		for i := 0; i < s.Len(); i++ {
			ret.Index(s.Len()-1-i).Set(s.Index(i))
		}
		return ret.Interface()
	}
	
	panic("Invalid type for reverse()")
}

func main() {
	str := "test"
	cyr := "котя"
	num := []int{1, 2, 3, 4}

	for _, v := range reverse(num).([]int) {
		fmt.Printf("%d", v)
	}
	fmt.Println()
	
	for _, v := range reverse(str).(string) {
		fmt.Printf("%c", v)
	}
	fmt.Println()
	
	fmt.Println(reverse(cyr))
}