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kotlinlang

Any way to write this in funcitonal fashion?
```
controls.mapValues {
    val ans = EnumSet.noneOf(NotificationTarget::class.java)
    if (it.value.pushSwitch.isChecked) ans += NotificationTarget.PUSH
    if (it.value.emailSwitch.isChecked) ans += NotificationTarget.EMAIL
    ans
}
```

```
controls.mapValues {
    EnumSet.copyOf(
            listOf(
                    it.value.pushSwitch to NotificationTarget.PUSH,
                    it.value.emailSwitch to NotificationTarget.EMAIL
            )
                    .filter { it.first.isChecked }
                    .map { it.second }
    )
}
```

Thank you, that’s an interesting approach, but too allocationful. There are many of switch pairs, and it’s not great to create extra map for each pair.

If you're worried about the performance of the functional approach, then it might just be better to do it imperatively

Couldn't you just store the mappings in a top level immutable Map?

I guess you'd have to do an extra filter, then...hmm

I thought about a global immutable map at the very first moment, but then I must tag actual switches somehow. Maybe I’d better stick with the original solution.