Slice exercises from the Go Tutorial

picture_demo_slices.go

package main

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

func Formula(x int, y int) uint8 {
	// return uint8((x + y) / 2)
	return uint8(x * y)
	// return uint8(x ^ y)
}

func Pic(dx, dy int) [][]uint8 {
	// initialise the picture frame of length dy
	mypic := make([][]uint8, dy)

	for x := 0; x < dx; x++ {
		// make a new slice of length dy
		mypic[x] = make([]uint8, dy)

		for y := 0; y < dy; y++ {
			value := Formula(x, y)
			// assign values to that location in mypic
			mypic[x][y] = value
		}
	}

	return mypic
}

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

Logic from the SO Question here

• outer loop to assign a[x] with a []uint8 slice of dx size
• an inner loop to assign each value a[x][y]