In other words, an ArrayList allows you to create a dynamic array whose size can be incremented or decremented.ĪrrayList is a nonsynchronized data collection, which means it is not thread-safe. What happens behind the scene is that a new, larger array is created and replaces the old one, which is removed. Specifically, when an element is added to an ArrayList, it is inserted into the array. In Kotlin, an ArrayList provides a MutableList implementation that uses an array as backing storage.
When to use a LinkedList over an ArrayList. 
When to use an ArrayList over a LinkedList. Why Kotlin does not provide a LinkedList implementation. TL DR: In this post, you’ll find out everything you need to know about ArrayList and LinkedList to learn how to choose the right data collection structure between the two. Let’s dig into ArrayList and LinkedList in Kotlin! In particular, by the end of this article, you will be able to easily tell when and why it is better to adopt an ArrayList over a LinkedList or vice versa. Here, you will learn how they are implemented behind the scenes in Kotlin, how they work, and what performance benefits they offer. In detail, ArrayList and LinkedList represent two of the most widely adopted JVM data collection structures. This is why you should know the characteristics of each of the most popular data collections offered by the programming language you are using. Adopting the correct data collection can make all the difference when it comes to performance and resource usage. Also, thanks to its interoperability with the JVM, you can choose between the many Java collections. 
Kotlin provides several data collection implementations.
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Antonello Zanini Follow I'm a software engineer, but I prefer to call myself a technology bishop.
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