Programming Kotlin

Chapter 5Using Collections

We use collections of objects in every single application, whether it’s business, scientific, or game development. You can pretty much use any collection available in Java directly from within Kotlin. But, Kotlin also offers a few view interfaces over Java collections, which provide a pleasant and a safer coding experience.

For example, Kotlin provides Pair and Triple for a collection of two or three values, respectively. For larger fixed-size collections we can use an array, but for more flexibility we may use lists. We also often use sets and associative maps. Kotlin offers all of them.

Kotlin provides both a mutable and an immutable flavor for collection interfaces that serve as views to Java collections. If ...