slices.go

package main
​
import (
	"golang.org/x/tour/pic"
)
​
func Pic(dx, dy int) [][]uint8 {
	// this makes "s" a slice ready to hold slices
	s := make([][]uint8, dy)
	
	// iterate through "y", slices in "s"
	for y := range s {
		// this makes the slices IN "s" ready to hold unsigned 8-bit integers
		s[y] = make([]uint8, dx)
		
		// iterrate through "x", the integers in "y"
		for x := range s[y] {
			s[y][x] = uint8(x/(4)^y/(4))
		}
	}
	return s
}
​
func main() {
	pic.Show(Pic)
}