How do I list an array in Kotlin?

How do I list an array in Kotlin?

Convert a list to an array in Kotlin

1. Using toTypedArray() function. List interface provides a toTypedArray() function that returns a typed array containing the list elements. fun main() {
2. Using Java 8 Stream. You can also use Stream to convert a list to an array.

How do you flatten a list on Kotlin?

Flatten a List of Lists in Kotlin

1. Using flatten() function. The standard solution to flatten a list in Kotlin is using the flatten() function.
2. Using flatMap() function.
3. Using forEach() function.
4. Using reduce() function.

How do you make a mutable ArrayList in Kotlin?

2. Creating a Mutable List in Kotlin

1. 2.1. ArrayList() We can create an ArrayList implementation of the mutable list simply by using a constructor: val arrayList = ArrayList() arrayList.add(“Kotlin”) arrayList.add(“Java”)
2. 2.2. mutableListOf()

How do I print an ArrayList in Kotlin?

Kotlin Program to Print an Array

1. fun main(args: Array) { val array = intArrayOf(1, 2, 3, 4, 5) for (element in array) { println(element) } }
2. import java.util.Arrays fun main(args: Array) { val array = intArrayOf(1, 2, 3, 4, 5) println(Arrays.toString(array)) }

What is the difference between ArrayList and list in Kotlin?

The major difference from usage side is that Arrays have a fixed size while (Mutable)List can adjust their size dynamically. Moreover Array is mutable whereas List is not. Furthermore kotlin. collections.

How do I use a list on Kotlin?

Inside main() , create a variable called numbers of type List because this will contain a read-only list of integers. Create a new List using the Kotlin standard library function listOf() , and pass in the elements of the list as arguments separated by commas.

How do you clone a list on Kotlin?

Clone a list in Kotlin

1. Using Copy Constructor. A simple and efficient solution is to use a copy constructor to clone a list, which creates a new object as a copy of an existing object.
2. Using addAll() function.
3. Using toCollection() function.
4. Using mutableListOf() function.
5. Implement the Cloneable Interface.
6. Using Data class.

What is FlatMap in Kotlin?

In general terms, FlatMap is used to combine two different collections and returns as a single collection . To understand it better let’s consider an example, let’s say we have a data class, data class MotorVehicle( val name: String, val model: Int, val manufacturer: String )

What is the difference between list and ArrayList in Kotlin?

Is list immutable in Kotlin?

In Kotlin, all non-mutable collections, such as List, are compile-time read-only by default, and not immutable. While the defined interfaces do not support methods to change data within the collection, the underlying data can still be changed.

How do you display an ArrayList?

To learn more, visit Java ArrayList addAll().

1. Access ArrayList Elements. To access an element from the arraylist, we use the get() method of the ArrayList class.
2. Change ArrayList Elements. To change elements of the arraylist, we use the set() method of the ArrayList class.
3. Remove ArrayList Elements.

How do I print everything in an ArrayList?

PRINTING ARRAYLIST

1. 1) Using for loop. //using for loop System.out.println(“Using For Loop\n “); for (int i = 0; i < arrlist.size();i++) { System.out.println(arrlist.get(i)); }
2. 2) Using for-each loop.
3. 3) Using iterator.
4. 4) Using list-iterator.

Should I use list or array Kotlin?

In Kotlin or any other programming languages, whenever we want to store similar types of data then all of us preferably use Arrays or Lists. Many developers think that both are the same thing and can be used interchangeably.

How do I get an element from a list in Kotlin?

For retrieving an element at a specific position, there is the function elementAt() . Call it with the integer number as an argument, and you’ll receive the collection element at the given position. The first element has the position 0 , and the last one is (size – 1) .

How do I iterate a list in Kotlin?

Iterate over a list in Kotlin

1. Using toString() function. If you want to display the list’s contents, you can simply print the string representation of the list using the toString() function.
2. Using Iterator. You can use a special iterator ListIterator , that additionally allows bi-directional access.
3. Using loop.

How do I copy an array in Kotlin?

Clone an array in Kotlin

1. Using clone() function. fun copy(arr: Array): Array { return arr. clone() } fun main() { val from = arrayOf(6, 7, 5, 2, 4) val to = copy(from)
2. Using copyOf() function. fun copy(arr: Array): Array { return arr. copyOf(arr. size) } fun main() {
3. Using copyOfRange() function.

Which came first Kotlin or Swift?

Swift was developed by Apple and first appeared in 2014. Kotlin, on the other hand, was designed by the JetBrains team and saw its first glimpse in 2011. But it got its due only in 2017 when Google made it an official language for Android development.

What are coroutines Kotlin?

A coroutine is a concurrency design pattern that you can use on Android to simplify code that executes asynchronously. Coroutines were added to Kotlin in version 1.3 and are based on established concepts from other languages.

Should I use array or list Kotlin?