Best Kotlin Books to Buy in January 2026
Kotlin in Action, Second Edition
How to Build Android Applications with Kotlin: A hands-on guide to developing, testing, and publishing production-grade Android 16 apps
Head First Kotlin: A Brain-Friendly Guide
Java to Kotlin: A Refactoring Guidebook
Kotlin Design Patterns and Best Practices: Elevate your Kotlin skills with classical and modern design patterns, coroutines, and microservices
Kotlin from Scratch: A Project-Based Introduction for the Intrepid Programmer
Kotlin: An Illustrated Guide
Kotlin Coroutines: Deep Dive (Kotlin for Developers)
In Kotlin, array annotations can be expressed using the @ArrayParameter annotation. This annotation can be used to indicate that an argument is an array and should be treated as such by the compiler. This can help improve type safety and provide additional information to developers working with the code. To express an array annotation argument in Kotlin, simply add the @ArrayParameter annotation before the argument declaration.
How to calculate the sum of all elements in an array in Kotlin?
You can calculate the sum of all elements in an array in Kotlin by using the sum() function.
Here is an example of how to calculate the sum of all elements in an array in Kotlin:
fun main() { val numbers = arrayOf(1, 2, 3, 4, 5)
val sum = numbers.sum()
println("The sum of all elements in the array is: $sum")
}
In this example, we have an array of integers called numbers. We use the sum() function on the array to calculate the sum of all elements in the array. Finally, we print out the sum.
You can use the sum() function on arrays of any type that is supported by Kotlin's standard library, such as integers, doubles, or floats.
How to convert a list to an array in Kotlin?
In Kotlin, you can convert a list to an array using the toTypedArray() extension function on the list. Here's an example:
val list = listOf("apple", "banana", "orange") val array = list.toTypedArray()
In this example, the list variable is converted to an array using the toTypedArray() function, and the resulting array is stored in the array variable.
What is the difference between single-dimensional and multi-dimensional arrays in Kotlin?
In Kotlin, a single-dimensional array is a collection of elements of the same data type arranged in a single row. It can be accessed by a single index value.
On the other hand, a multi-dimensional array is a collection of elements stored in multiple rows and columns. It can be visualized as a matrix, with each element being accessed by a pair of index values (row index and column index).
In summary, the main difference between single-dimensional and multi-dimensional arrays in Kotlin is the way the elements are structured and accessed. Single-dimensional arrays are one-dimensional and accessed by a single index value, while multi-dimensional arrays have multiple dimensions (rows and columns) and are accessed by pairs of indices.