The code clearly says we're interested in the possibility the array is empty. The size of the empty array is zero if we try to access an element in the empty array then Kotlin throws java.lang.ArrayIndexOutOfBoundsException as there is no element is present. To understand the arraylist concepts in details. There are several ways to do this, but a common way is to use Kotlin’s indices property. Kotlin Properties – Read/Write Properties from/to .properties/.XML File Kotlin – Convert Map to/from Properties Kotlin – Encode (Decode) File/Image to Base64 In Kotlin, you can use reverse() extension function to reverse an array... Another solution is to create an auxiliary array of same type and size as the original array. An array is a collection of similar data types either of Int, String, etc. In this post, I will show you three different ways to do that with examples. Syntax: val num = Array(3, {i-> i*1}) Using the Array constructor – Since Array is a class in Kotlin, we can also use the Array constructor to create an array. There are several ways to initialize an empty list as discussed below: 1. listOf() function. Kotlin Array. Then fill it with elements from the original array in reverse order. Arrays in Kotlin are able to store multiple values of different data types. Exploring ArrayList Functions. Its notation is more readable than array.size == 0. Finally, copy contents of the auxiliary array into the source array. val countriesArrayList = ArrayList() We have created an empty arrayList using constructor. 7. The constructor takes two parameters: The size of the array, and; A function which accepts the index of a given element and returns the initial value of that element. In this case, we can create an array of null values. The syntax is simple, just use the keyword ArrayList and create a arraylist. In Kotlin, you can create a data class to hold the data. Using arrayOf : We have a couple of different ways in Kotlin to create one empty string array. Array in Kotlinis mutable in nature with fixed size which means we can perform both read and write operations on elements of array. The reason why would you want to mark a class as data is to let compiler know that you are creating this class for holding the data, compiler then creates several functions automatically for your data class which would be helpful in managing data. Array is collection of similar data types either of Int, String etc. Kotlin ArrayList Examples. Kotlin Empty Array : An empty array does not contain any element in it while initializing we may create an empty array. Constructor of array: Array constructor is declared with specified size and init function. As you may guess, this method will return true if the array is empty. min() and max() Math methods returning the lowest element (min()) and the greatest element (max()) of the array. We can use range to access and set the values of the array in a for loop. Kotlin Array. This article explores different ways to initialize an empty List in Kotlin. This property returns a range of valid indices for the array. An array is a collection of key/value pairs. Array in Kotlin is mutable in nature with fixed size which means we can perform both read and write operations, on the elements of an array. If you need an immutable empty list instance, you can use listOf() function as shown below. This tutorial is all about Kotlin ArrayList. After instantiation, we can access and set the fields of the array. 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