https://go-tour-th.appspot.com/moretypes/18

moretype18.go

package main

import "golang.org/x/tour/pic"

func Pic(dx, dy int) [][]uint8 {
	slice := make([][]uint8, dx, dx)
	// loop dx
	for x := 0; x < dx; x++ {
		slice[x] = make([]uint8, dy, dy)
		// loop dy
		for y := 0; y < dy; y++ {
			// set value in pixel
			slice[x][y] = uint8(x^y)
		}
	}
	return slice
}

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