using strings in Go

package main

import (
	"fmt"
	"strconv"
	"strings"
)

func main() {
	// string to []byte
	str := "hello, world"
	b := []byte(str)
	fmt.Printf("%T %v ~> %T %v\n", str, str, b, b)

	// []byte to string
	s := string(b)
	fmt.Printf("%T %v ~> %T %v\n", b, b, s, s)

	// number to string
	i := 123
	is := strconv.Itoa(i)
	fmt.Printf("%T %v ~> %T %v\n", i, i, is, is)

	ii := 456
	iis := fmt.Sprintf("%d", ii)
	fmt.Printf("%T %v ~> %T %v\n", ii, ii, iis, iis)

	// string concatenation
	strc := "abc"
	strc = strc + "def"
	fmt.Println(strc)

	var sb strings.Builder
	sb.WriteString("abc")
	sb.WriteString("def")
	fmt.Println(sb.String())
}