Collections

The Kotlin collections are actually direct instances of the collections in the JDK. There’s no conversion of wrapping involved. So, if you didn’t skimp on your study of collections while you were in Java, that will certainly come in handy now. Although Kotlin didn’t define its own collections code, it did add quite a few convenience functions to the framework, which is a welcome addition because it makes the collections easier to work with.
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Higher Order Functions

The name higher order functions come from the world of Mathematics, in there, a higher order function is also called functional, functional form or functor, and apparently, they take the difference between function and values, a bit more seriously than programming folks. NOTE It makes me wonder if there a thing such as “lower order functions”, I don’t think this term was ever used, neither in programming nor in the world of Math.
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Kotlin

It’s the new(est) kid on the the JVM block. It’s from JetBrains, they’re the guys who built IntelliJ. They’ve been around for quite some time, so chances are you already know them. Kotlin has also been around for quite sometime, since 2011 in fact — it gained a lot of traction and attention probably 2016 or 2017 (I’m not sure, I’m too lazy to research). The “hooray” moment for Kotlin was probably during Google I/O 2017, because they (Google) announced that it can now be used for Android programming.
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