Variadic function of interfaces called with a string slice

go_challenge_error.go

package main

import (
	"fmt"
)

type TestStruct struct {
	int
	string
}

func UniqueOf(slice ...interface{}) []interface{} {
	seen := make(map[interface{}]int, len(slice))
	result := make([]interface{}, len(slice))
	resultIndex := 0
	for _, val := range slice {
		if _, ok := seen[val]; !ok {
			result[resultIndex] = val
			resultIndex++
		}
		seen[val] = 1
	}
	return result[:resultIndex]
}

func main() {
	// this won't work, see:
	// https://groups.google.com/forum/#!msg/golang-nuts/Qwfovy0uGss/XoWCJo_sndEJ
	strslice := []string{"hello", "hi", "hello"}
	fmt.Printf("%v is unique\n", UniqueOf(strslice...))
}

/* Output
tim-schmelmers-macbook:go tim$ go run go_challenge_error.go
# command-line-arguments
./go_challenge_error.go:30: cannot use strslice (type []string) as type []interface {} in function argument
*/