Go: Sort an array of interfaces so that strings are on top

multiarraysort.go

// This is a very basic demonstration of how to implement sort.Interface
// to do some custom sorting. Here, a slice of interfaces
// (ints and strings) are sorted so that the strings are on top.
// There is no other sorting of the elements, but the example
// provides a layout that can be used to implement more complex sorting.

package main

import "fmt"
import "sort"

type MultiArray []interface{}

func (a MultiArray) Len() int { fmt.Printf("%s\n", a) ; return len(a) }
func (a MultiArray) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
func (a MultiArray) Less(i, j int) bool {
	switch a[i].(type) {
		case string:
			fmt.Println("found string")
			return true
	}
	return false
}

func main() {
	foo := []interface{} {
		"foo",
		42,
		"bar",
		84,
	}
	fmt.Printf("%d\n", len(foo))
	sort.Sort(MultiArray(foo))
	fmt.Printf("%s\n", foo)
}