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kotlinlang

<@U8LBKF6AJ> soooo are we going to live stream the Kotlin meetup next month?

Hi Mitch, I think we could use Google Meet and it should work okay.  The main thing we still need is a speaker, or a few lightning talks.  I've asked a couple people, but no luck so far.  I've got a few things I've been toying around with, but nothing that would likely be ready in time for next week.

Actually, I've got one thing I could demo about using JUnit 5's `DynamicTest` from Kotlin for parameterized unit testing.  It's really only enough content for a quick lightning talk, though, so we'd need something more or it'll be a pretty short meeting.

I wouldn’t mind doing some research on Kotlin Higher Order  Functions… i.e. Run, Let, Apply, etc…..
It’d probably end up being 15 - 30 mins to go in depth

<@UUSG8A1ST> Do you have anything you’d present on?

Some other things I need to learn more about is
• When to use lateinit vs lazy in Android Dev
• Reified
• Inline
• Generics
• Alias …. I have an idea but wonder if there’s more to it
• Writing Gradle Tasks… Could be a Groovy --&gt; Kotlin equiv
• Coroutines

I could do something on lateinit vs lazy regarding thread safety. Maybe 15-30 minutes as well :)

I'd love to hear more about lateinit vs lazy, my coworker says lateinit is evil!  I like that lazy works well with LiveDatas

I was experimenting with lateinit for my `previousWallTimeNanos` property here:

```private const val UNINITIALIZED = -1L

class GameClock {

	private var previousWallTimeNanos = UNINITIALIZED

	var deltaTimeNanos: Long = 0L
		private set

	fun update(wallTimeNanos: Long) {

		if (previousWallTimeNanos == UNINITIALIZED) {
			previousWallTimeNanos = wallTimeNanos
			return
		}

		deltaTimeNanos = wallTimeNanos - previousWallTimeNanos
		previousWallTimeNanos = wallTimeNanos
	}
}```
Unfortunately...

```'lateinit' modifier is not allowed on properties of primitive types```
So I ended up going with the plain old "if uninitialized" logic. The use case is single threaded, so I didn't need to worry about synchronization.

I thought about creating a "LateInit" <https://kotlinlang.org/docs/reference/delegated-properties.html|property delegate>, but I'd only need it for the one instance in this application, so it didn't seem worth the added complexity.

I'm a little surprised there isn't already such a property delegate in the <#C0B8Q383C|stdlib>. Maybe I'll write one up and submit a pull request.