[swift-evolution] ternary operator ?: suggestion

[Charles Constant]

> In the case where your input is hashable, you could just do:
>
> let i = [.Red:0xff0000, .Green:0x00ff00, .Blue:0x0000ff][color]

You forgot to declare the type, which is mandatory if you want to use
abbreviated cases like ".Red" to construct a one-off like that. That's one
of the reasons I complained that using a Dictionary is not a pleasant
alternative earlier on. The proposal ought to infer the enum Type, just
like a normal Switch statement.

On top of that, the limitations you mention also limit usefulness.

If it weren't for these issues, it would be good enough for me.
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