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kotlinlang

Hello, guys. Can you please help me to translate piece of code into pure Kotlin? 

map here is mapping from String to MyClass. I have an extension property MyClass.finished;
I need to create new instance of object if it is not in `map`, or it is finished. If it is not finished and in `map`, just return that value
 How to do it in Kotlin-way?
```
if (id in map) {
            val existing = map[id]!!
            if (!existing.finished)
                return existing
}

val timer = map[id] ?: MyClass.create()
// everything not so important here...
```