https://tour.golang.org/moretypes/18

exercise-slices.go

package main

import (
	//"fmt"
	"golang.org/x/tour/pic"
)

func Pic(dx, dy int) [][]uint8 {

	//fmt.Println(dx, dy)

	s := make([][]uint8, dy)

	for i := range s {
		s[i] = make([]uint8, dx)

		for j := range s[i] {
			s[i][j] = uint8((j * i))
		}
	}

	return s
}

func main() {
	pic.Show(Pic)
}