Reverse and capitalize strings from standard input in Go

stdIN.go

package main

import (
	"bufio"
	"fmt"
	"os"
	"strings"
)

func reverseText(s string) string {
	// Store the length of the string "s"
	n := len(s)
	//make a slice of runes of length "n"
	runes := make([]rune, n)
	// loop over runes for the length of variable s
	for _, rune := range s {
		n--
		runes[n] = rune
	}
	return strings.ToUpper(string(runes[n:]))
}

func main() {
	var f *os.File
	f = os.Stdin
	defer f.Close()

	scanner := bufio.NewScanner(f)
	for scanner.Scan() {
		rev := reverseText(scanner.Text())

		fmt.Println(">", rev)
	}
}

I was going through "Mastering Go" by Mihalis Tsoukalos, and one of the exercies was to print from a bufio scanner. I wanted to extend the book's code a little bit. So I looked a solution and a small routine to reverse text.

I found a straightforward solution on stackoverflow, and stepped through the code a few times until I figured out exactly what is going on.

Although I don't think I will have much utility in reverse strings and input pieces of text in further programs, this small challenged forces me to think a bit deeper about the algorithms I am using in these toy go scripts.