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Sierpinski Carpet in Go Programming Language

Example

package main

import (
	"fmt"
	"strings"
	"unicode/utf8"
)

func main() {
	var order = 3
	var hash = "#"
	carpet := []string{hash}
	for ; order > 0; order-- {
		hole := strings.Repeat(" ", utf8.RuneCountInString(carpet[0]))
		middle := make([]string, len(carpet))
		for i, s := range carpet {
			middle[i] = s + hole + s
			carpet[i] = strings.Repeat(s, 3)
		}
		carpet = append(append(carpet, middle...), carpet...)
	}

	for _, r := range carpet {
		fmt.Println(r)
	}
}

Output

###########################
# ## ## ## ## ## ## ## ## #
###########################
###   ######   ######   ###
# #   # ## #   # ## #   # #
###   ######   ######   ###
###########################
# ## ## ## ## ## ## ## ## #
###########################
#########         #########
# ## ## #         # ## ## #
#########         #########
###   ###         ###   ###
# #   # #         # #   # #
###   ###         ###   ###
#########         #########
# ## ## #         # ## ## #
#########         #########
###########################
# ## ## ## ## ## ## ## ## #
###########################
###   ######   ######   ###
# #   # ## #   # ## #   # #
###   ######   ######   ###
###########################
# ## ## ## ## ## ## ## ## #
###########################
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