How to Shuffle Elements Of A Mutable List In Kotlin?

7 minutes read

In Kotlin, you can shuffle the elements of a mutable list using the shuffle() method. This method reorders the elements in a random fashion, providing a way to shuffle the list effectively.


To shuffle elements of a mutable list, follow the steps below:

  1. Start by having a mutable list with the elements you want to shuffle. For example, let's assume we have a mutable list called myList containing some integers: val myList = mutableListOf(1, 2, 3, 4, 5)
  2. Simply call the shuffle() function on your mutable list to shuffle its elements: myList.shuffle() After executing this line, the elements of myList will be rearranged randomly.
  3. If you want to shuffle the list using a custom random number generator, you can pass an instance of Random as an argument to the shuffle() method. For example: val random = Random() myList.shuffle(random) This will shuffle the elements of myList using the specified random instance.


That's it! By using the shuffle() method, you can easily shuffle the elements of a mutable list in Kotlin.

Best Kotlin Books to Read in 2024

1
Atomic Kotlin

Rating is 5 out of 5

Atomic Kotlin

2
Kotlin in Action

Rating is 4.9 out of 5

Kotlin in Action

3
Head First Kotlin: A Brain-Friendly Guide

Rating is 4.8 out of 5

Head First Kotlin: A Brain-Friendly Guide

4
Kotlin Programming: The Big Nerd Ranch Guide (Big Nerd Ranch Guides)

Rating is 4.7 out of 5

Kotlin Programming: The Big Nerd Ranch Guide (Big Nerd Ranch Guides)

5
Kotlin Cookbook: A Problem-Focused Approach

Rating is 4.6 out of 5

Kotlin Cookbook: A Problem-Focused Approach

6
Java to Kotlin: A Refactoring Guidebook

Rating is 4.5 out of 5

Java to Kotlin: A Refactoring Guidebook

7
Programming Kotlin: Create Elegant, Expressive, and Performant JVM and Android Applications

Rating is 4.4 out of 5

Programming Kotlin: Create Elegant, Expressive, and Performant JVM and Android Applications

8
Advanced Kotlin (Kotlin for Developers Book 4)

Rating is 4.3 out of 5

Advanced Kotlin (Kotlin for Developers Book 4)


What is the easiest method to shuffle elements in a mutable list using Kotlin?

The easiest method to shuffle elements in a mutable list using Kotlin is by using the shuffle() function provided by the Kotlin standard library. This function shuffles the elements in-place within the list. Here is an example:

1
2
val list = mutableListOf(1, 2, 3, 4, 5)
list.shuffle()


After calling shuffle(), the elements in the list will be shuffled randomly.


How can I rearrange the elements randomly within a mutable list in Kotlin?

To rearrange the elements randomly within a mutable list in Kotlin, you can use the shuffle function provided by the standard library. Here's an example:

1
2
3
4
5
fun main() {
    val list = mutableListOf(1, 2, 3, 4, 5)
    list.shuffle()
    println(list)
}


The shuffle function randomly reorders the elements in the list. Running the code snippet above will produce different outputs each time because the elements are shuffled randomly.


Sample output:

1
[3, 5, 4, 2, 1]


Note that the shuffle function modifies the original list in-place. If you want to keep the original list intact, you can create a copy of the list before shuffling:

1
2
3
val list = mutableListOf(1, 2, 3, 4, 5)
val shuffledList = list.shuffled()
println(shuffledList)


The shuffled function returns a new list with the elements rearranged randomly, leaving the original list unchanged.


Sample output:

1
[5, 4, 2, 1, 3]



What is the most efficient way to shuffle elements in a mutable list using Kotlin?

The most efficient way to shuffle elements in a mutable list using Kotlin is by using the Collections.shuffle() function from the Java Collections framework.


Here's an example of shuffling a mutable list using Kotlin:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
import java.util.Collections

fun main() {
    val list = mutableListOf(1, 2, 3, 4, 5)
    
    // Shuffle the list
    Collections.shuffle(list)
    
    // Print the shuffled list
    println(list)
}


This code shuffles the elements of the list in-place, modifying the original list. The Collections.shuffle() function uses an optimized version of the Fisher-Yates algorithm to ensure a uniform shuffling of the elements.

Facebook Twitter LinkedIn Whatsapp Pocket

Related Posts:

In Kotlin, you can create a mutable list of alphabets by using the MutableList interface. This interface allows you to add, remove, update, and perform various operations on the elements of the list. Here's how you can create a mutable list of alphabets:St...
Kotlin reflection allows you to inspect and manipulate code at runtime. Although Kotlin is fully compatible with Java, accessing Kotlin's reflection API from Java requires some extra steps.To use Kotlin reflection in Java, you need to follow these steps:Im...
Working with collections in Kotlin involves the use of lists, sets, and maps. These data structures allow you to store, retrieve, and manipulate collections of elements.Lists: A list is an ordered collection of elements. It allows duplicate elements. You can c...