A Tour of Go - Exercise: Slices

exercise-slices.go

// Implement Pic. It should return a slice of length dy, each element of which is 
// a slice of dx 8-bit unsigned integers. When you run the program, it will display your picture, 
// interpreting the integers as grayscale (well, bluescale) values.
//
// The choice of image is up to you. Interesting functions include (x+y)/2, x*y, and x^y.
//
// (You need to use a loop to allocate each []uint8 inside the [][]uint8.)
//
// (Use uint8(intValue) to convert between types.)
package main

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

func Pic(dx, dy int) [][]uint8 {
	result := make([][]uint8, dy, dy)
	for i := range result {
		result[i] = make([]uint8, dx, dx)
		for j := range result[i] {
			result[i][j] = uint8(i * j)
		}
	}

	return result
}

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