The former is a primitive type, not a class, storing an actual binary value representing a given integer. The actual difference between IntArray and an Array in Kotlin is basically the same as the difference between int and Integer in Java. The main difference between an IntArray and an Array is that the former is represented, under the hood, as an int, whereas the latter gets compiled into an Integer. Nonetheless, they come with the same methods. There’s no subtyping between these “primitive” arrays and their generic counterpart, i.e., Array. Hence, Array is not considered a sub-type of Array if T is of subtype U.įor primitive types, Kotlin also provides us with dedicated arrays, such as IntArray or ShortArray. These array implementations are invariant. Array defines several methods allowing us to read/write an element at a given index, query the size, and so on. The first is the Array class, generic over the type T, representing an array of elements of type T. Koltin has two different array implementations. Finally, we’ll compare IntArray and Array with lists, a different collection type. We’ll analyze two different types representing an array of integers, IntArray and Array. In this article, we’ll examine arrays and integers in Kotlin. A typical example is choosing a suitable collection class for our needs.Īs a matter of fact, the Kotlin library comes with a variety of different collections, that is, types grouping a number (possibly zero) of collection items. As is common with modern languages, such expressiveness often means we can implement the same feature in several ways. Kotlin is a very powerful statically typed programming language allowing us to write very expressive yet concise code. I enjoy learning and experimenting with new technologies and languages, looking for effective ways to employ them. Matteo Di Pirro Follow I am an enthusiastic young software engineer who specialized in the theory of programming languages and type safety.
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