Working variadic function with interfaces as arguments

go_challenge_works.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() {
	fmt.Printf("%v is unique\n",
		UniqueOf("hello", 15, "hello", 15, 16, 42,
			TestStruct{1, "hello"}, TestStruct{2, "hi"}, TestStruct{2, "hi"}))
}

/* Output
tim-schmelmers-macbook:go tim$ go run go_challenge_works.go
[hello 15 16 42 {1 hello} {2 hi}] is unique
*/