Sample code for interface post

sample.go

package main

import (
	"fmt"
	"bytes"
	"strconv"
)

type operand interface {
}

func main() {
	fmt.Println("Hello!")
	Addition(1, "foo", 2, "bar", 3, "baz")
}

func Addition(operands ...operand) {
	var buf bytes.Buffer
	for idx, operand := range operands {
		switch operand.(type) {
		case int:
			buf.WriteString(strconv.Itoa(operand.(int)))
		case string:
			buf.WriteString(operand.(string))
		}
		if idx != len(operands) - 1 {
			buf.WriteString(" + ")
		}
	}
	fmt.Println(buf.String())
}