Golang generic Sum function https://blog.golang.org/generics-next-step

main.go

package main

import (
	"fmt"
)

type number interface {
	type int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64, float32, float64, complex64, complex128
}

func Sum(type T number)(i []T) (sum T) {
	for _, n := range i {
		sum += n
	}
	return sum
}

func main() {
	fmt.Println(Sum([]int{1, 2}))
	fmt.Println(Sum([]int8{1, 2}))
	fmt.Println(Sum([]int16{1, 2}))
	fmt.Println(Sum([]int32{1, 2}))
	fmt.Println(Sum([]int64{1, 2}))
	fmt.Println(Sum([]uint{1, 2}))
	fmt.Println(Sum([]uint8{1, 2}))
	fmt.Println(Sum([]uint16{1, 2}))
	fmt.Println(Sum([]uint32{1, 2}))
	fmt.Println(Sum([]uint64{1, 2}))
	fmt.Println(Sum([]float32{1, 2}))
	fmt.Println(Sum([]float64{1, 2}))
	fmt.Println(Sum([]complex64{1, 2}))
	fmt.Println(Sum([]complex128{1, 2}))
}