matrix from go

matrix.go

package main

import (
	"fmt"
	"math/rand"
	"time"
)

func main() {
	box := append(packRune('0', '9'), packRune('a', 'z')...)
	box = append(box, packRune('A', 'Z')...)

	rand.Seed(time.Now().UnixNano())
	for {
		fmt.Print("\x1b[32m", string(box[rand.Intn(len(box))]), "\x1b[0m")
		time.Sleep(100 * time.Microsecond)
	}
}

func packRune(start, end rune) []rune {
	var box []rune

	r := start
	for r-1 != end {
		box = append(box, r)
		r++
	}

	return box
}