What is the shortest way to simply sort an array of structs by (arbitrary) field names?

by

As of Go 1.8 you can now use sort.Slice to sort a slice:

sort.Slice(planets, func(i, j int) bool {
  return planets[i].Axis < planets[j].Axis
})

There is normally no reason to use an array instead of a slice, but in your example you are using an array, so you have to overlay it with a slice (add [:]) to make it work with sort.Slice:

sort.Slice(planets[:], func(i, j int) bool {
  return planets[i].Axis < planets[j].Axis
})

The sorting changes the array, so if you really want you can continue to use the array instead of the slice after the sorting.

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