cmd-args.go

// print name of calling program,
// list args passed each on a new line,
// print time elapsed

package main

import (
	"fmt"
	"os"
	"strings"
	"time"
)

func main() {
	start := time.Now()
	fmt.Println("binary's name => ", os.Args[0])

	// op1
	// ---
	// s, sep := "", " "
	// for i, arg := range os.Args[1:] {
	// 	s = strconv.Itoa(i) + sep + arg
	// 	fmt.Println(s)
	// }

	// op2
	// ---
	// (fastest but cant get reference to index ?)
  
	fmt.Println(strings.Join(os.Args[1:], "\n"))
	end := time.Now()
	elapsed := end.Sub(start)
	fmt.Println("time elapsed: " + elapsed.String())
}