Looking at Kotlin documentation, it says that things like Set or List are interfaces. So why can I call the constructor like "val list = List<Int>(3 , {it})" and have it work, when you can't instantiate interfaces?

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    The Kotlin Programming Language.

    • For number 2, check out AbstractList.kt, and go up to it's parent library to find most of what you're looking for. It's probably not as neatly-packed as Java classes are, but nothing's stopping you from looking at Kotlin's internal implementation.

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