Great points Brent. I think the ValuesEnumerable method would be the most
straight forward. Also, the number of cases are likely only going to be in
range of 6–20, so iterating would be fine I think. People can create something
like `Dictionary(Planet.allValues.enumerated().lazy.map{ ($1, $0) })` (I think
that’s right) if they really need.
> On 2 Jun 2016, at 2:40 PM, Brent Royal-Gordon via swift-evolution
> <[email protected]> wrote:
>
> Or the `ValuesEnumerable` proposal would give you a convenient, though
> slightly slow, way to do two-way lookup by order:
>
> enum Planet: String, ValuesEnumerable {
> var order: Int {
> return Planet.allValues.index(of: self)!
> }
> init(order: Int) {
> self = Planet.allValues[order]
> }
> case mercury, venus, …
> }
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