An answer to the Slices exercise in A Tour of Go

exercise-slices.go

package main

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

func Pic(dx, dy int) [][]uint8 {
    grid := make([][]uint8, dy)
    for y := range grid {
        line := make([]uint8, dx)
        for x := range line {
            line[x] = uint8(y-x)
        }
        grid[y] = line
        // why doesn't this work instead?
        // grid = append(grid, line)
    }
    return grid
}

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

You should move line 6 (line := make([]uint8, dx)) between lines 8 and 9.

Righto, @ibdimitrov. Thanks for the heads up.