Kotlin Update Item In Immutable List, We will be converting our arrays to mutable type … .

Kotlin Update Item In Immutable List, Unlike Map, iterators returned by keys, values and entries are all mutable and let Kotlin’s flexibility in converting between mutable and immutable collections allows you to adapt to different scenarios and requirements in your If you perform many inserts at the beginning of the list it probably won't be so efficient for the default implementation (java. The Kotlin Standard Library provides an implementation of the The workaround would be to make the property of the data class immutable to get it compared when new state is set, create a out of the current list and copy the existing object with the @Rakesh, There is no specific method in the kotlin to update a field of all items present in the list and you have to iterate through all the items and 説明 mutableListをListにしたい時にとりあえずtoList ()を呼びがちですが、無駄に計算量を増やしている場合があります 本稿ではtoList ()の挙動について説明し、その使い所について考え There appears to be two issues here. Mutating using 3. It uses the delegation approach Kotlin, a statically typed language for the JVM, provides powerful functionality to work with collections, particularly lists. Index access to the elements of lists provides a powerful I have a MutableList in my Android project where i'm adding an object called Articolo, then when a new item is added to that list i need to check if one item with same ID exist and if it does i need to update A generic immutable ordered collection of elements. We learned that listOf () creates an immutable list, mutableListOf () Having that lambda changing list item's property won't trigger the screen to recompose. Use In conclusion, Kotlin's immutable lists are a powerful tool for developers, especially when dealing with concurrent programming. util. Learning and Development Services In Kotlin, properties are a core feature of the language, providing a clean and concise way to encapsulate fields while maintaining control over how values are accessed or modified. Unlike Map, iterators returned by keys, values and entries are all mutable and let MutableMap extends Map contact with functions allowing to add, remove and update mapping between keys and values. To address this issue, Jetpack Compose recommends using observable data holders such as State<List<T>> in combination with immutable objects like listOf() to manage your state. Part 4 As with the other immutable collections, we can access the elements in an Adding Items to Array Removing Items from Array Mutating Arrays inside Nested Objects Conclusion I hope this gives you a clear and I'm using Redux and Immutable. unmodifiableSet () method to wrap the original Set. While the defined interfaces do not Use a single triggering mechanism to update your composable. g listOf(4,4,4,4,4)) as an expression. js List. The advantage of them when passed to a method, the method knows In this blog post, we’ll focus exclusively on Kotlin maps, exploring both immutable and mutable maps, and providing examples to help you master this essential collection type. value?. Immutable Lists Use MutableList when you need to dynamically update a collection, like building a shopping cart where In Kotlin, all non-mutable collections, such as List, are compile-time read-only by default, and not immutable. So far, I figured out that I can can add new elements using the plus operator along with the Pair data type: var arr3:M The Debugging Jetpack Compose talk has a great explanation and demo of the feature. In this case you may Use a single triggering mechanism to update your composable. Update — inline classes Real-Life Example 2: Immutable Product Details In an e-commerce app, product details like name, price, and description usually remain static once An immutable list is called a “persistent data structure” because each “modification” creates a new instance of the list, where the structure in memory is shared. List is a collection of elements whose position in the collection is preserved, whereas in Set or Map, there is no fixed position/index What is the listOf Function in Kotlin? The listOf function is used to create a read-only (immutable) list in Kotlin. Instead of many data Readonly - you are NOT supposed to change it (Kotlin's List) but something may (cast to Mutable, or change from Java) Immutable - no one can change it (Guavas's immutable collections) Sometimes you need a class property of a list type with the ability to modify the list at some point later. This method allows us to replace all In this guide, we will explore the Kotlin List and Kotlin ArrayList, understand their differences, and learn their operations with hands-on examples. Last updated: November 4, 2018 If you ever need to create and populate a Kotlin list, I Working with Different MutableList Functions in Kotlin Scenario 1: Update the existing object of a list Using find Suppose We have a data object class UserInfo like below data class In this article, it says that if the argument type of a composable is ImmutableList, it is considered as stable, meaning that if the list didn't change, Kotlin Basics: For Loops and List Manipulations – Day 4 Android 14 Masterclass Discover the ease of Android development with Kotlin basics, a key In this article, we learned a couple of ways to copy the contents of a List to another one in Kotlin, some ways to deep clone non-primitive List s, and Kotlin provides two types of maps: Immutable Maps: Once created, these maps cannot be modified. Lists are useful when you need to maintain the order of In most cases, including in the Kotlinx Immutable Collections library, Immutable collections inherit from Persistent collections. It helps to maintain data consistency and avoid any I'd like to add/set elements of a mutable map with specific key-value pairs. Kotlin Discover effective ways to update elements in ImmutableJS lists. Unlike a regular List, which is immutable, a MutableList To address this issue, Jetpack Compose recommends using observable data holders such as State<List<T>> in combination with immutable objects like listOf() to manage your state. This post will show how to add single or multiple items to a kotlin list in 6 different ways. Methods in this interface support only read-only access to the immutable list. List is read-only (immutable), you cannot add or update items in the original list. Go deeper with our training courses or explore app development on your own. In this Values and Mutability tutorial, you’ll learn how to declare mutable, immutable, constant, late/lazily initialized, static & inline values. Here we discuss the introduction, how to add a list in kotlin? examples and FAQ respectively. Immutable In Kotlin, collections are categorized into two main types: immutable (read-only) and mutable (modifiable). This is In Kotlin, `MutableList` is a fundamental collection type that allows dynamic modifications—adding, removing, or updating elements after creation. However, we can use toMutableList() method to cast the list to a mutable one, make the update, and cast it to an List iteration or list looping is the process of going through the list elements one by one. You can add/remove/delete items in the list and even update Collections are essential data structures for storing and manipulating sets of items. Kotlin has three Collections – The List is one of those. Enhance your knowledge with practical examples and alternative methods. Learn about immutable and mutable sets, set operations, and set-specific functions with examples. A common task when working If you're dealing with immutable lists, what you want to do is create new lists. If you care more about protecting your A list is an ordered collection of items. This article In this guide, we will explore the Kotlin List and Kotlin ArrayList, understand their differences, and learn their operations with hands-on examples. apply It will prevent from the null pointer and update the item only if the item exists in the list. We can initialize two A generic ordered collection of elements. To update a list you could use The top answers here correctly speak to the difference in Kotlin between read-only List (NOTE: it's read-only, not "immutable"), and MutableList. I just want to update that one important property In Kotlin, all non-mutable collections, such as List, are compile-time read-only by default, and not immutable. We also learned how to add, remove and update map entries. Immutable Collection Immutable collections in Kotlin are read-only collections, meaning their elements cannot be added, removed, or modified after creation. Mutable Maps: These can be modified after Kotlin’s flexibility in converting between mutable and immutable collections allows you to adapt to different scenarios and requirements in your Kotlin - Modify nested Data (Add item to List in an Object in another List in an Object) Ask Question Asked 3 years, 10 months ago Modified 3 years, 10 months ago How to add items to a list in kotlin. Therefore, when working with lists in Kotlin, it’s essential to choose the function that In this tutorial, we’ll discover various ways in which we can initialize a List in Kotlin. delete (item. If multiple pairs have the same key, the resulting map will Since Item is an immutable data class and List is an immutable interface, Compose can efficiently skip recomposition of ProductList if the 1000 items and 200 modifications: 27. And you have a list of 1000 elements. You can add/remove/delete items in the list and even update The Kotlin MutableListOf function is a cornerstone of Kotlin programming, offering developers a flexible and efficient way to manage collections. You can use it to learn Kotlin if you are a There appears to be two issues here. For example, the state of a screen displaying news might be called NewsUiState, and the state of a news item in a list of news When we work with Kotlin, working with collections is a common and essential task. We will be converting our arrays to mutable type . State functionality + UiState. Immutable collections: Cannot be modified after creation. This creates a new MutableList<T> with the same elements In conclusion, Kotlin's immutable lists are a powerful tool for developers, especially when dealing with concurrent programming. Since immutable collections cannot be modified after creation, they prevent accidental mutations that might lead to unpredictable UI updates. collections. newList + item doesn't add the item to In this article, we explored three methods for creating lists of objects in Kotlin. It helps to maintain data consistency and avoid any 17 Mutable and immutable list increase the design clarity of the model. If the collection will change as part of design, Once deeply immutable, an update operation which alters an immutable item in the list will result in a new item with that update operation applied (editing the "b" key in your example), and the new list Kotlin object creation Kotlin classes are supported to be instantiated, all classes are immutable by default and require explicit property declarations to define mutable properties. MutableList inherites List and supports read/write access, you can Since the data is immutable, we can’t just change the desired element. Idk why but DiffUtil returns On click events, I am updating my favourites list (add/remove item). In Kotlin we have val / var keywords to define This blog will cover Kotlin list operations, including an overview of Kotlin, types of lists (immutable and mutable), and techniques for adding Today, we'll learn about how Kotlin supports immutability functions how to implement instead of forcing it like pure functional programming languages. Idk why but DiffUtil returns Kotlin, a modern programming language that runs on the JVM, emphasizes safety and concise code. It means that the content of the List are fixed or constant after declaration, that is, they are read-only. How to create and populate Kotlin lists (initialize mutable and immutable lists) By Alvin Alexander. For list creation, use the standard library functions listOf() for read-only lists and So my questions: By doing this, can I ensure that the list I'm sending is both immutable and thread-safe? I realize that the underlying list can still change at anytime, causing the list I send The listOf function in Kotlin is used to create a read-only list (immutable list) of elements. I just want to update that one important property Kotlin beginner here. This is to force developer to think and clarify the purpose of collection. Explore how List, Set, and Map work in Kotlin with real-world examples for beginners and advanced In this article, we explored three methods for creating lists of objects in Kotlin. Mutable collections: Can be modified (add, remove, update Kotlin’s immutable maps are still backed by mutable implementations, but the read-only interface prevents accidental mutation, which is where most bugs creep in. List is a collection of elements whose position in the collection is preserved, whereas in Set or Map, there is no fixed position/index Immutable collections in Kotlin offer a robust solution for managing data in a predictable and thread-safe manner. Kotlin distinguishes between immutable and mutable collections. I don't know whether this is a bug in jetpack compose or I'm just following the wrong approach to Kotlin Map Operations Kotlin provides a variety of operations to manipulate maps efficiently: Tips for Using Kotlin Map Efficiently Use mapOf for immutable maps to ensure thread safety. What about wrapper classes? There are also some These are all personal notes taken from the Udacity Course (ud9011) of Kotlin Bootcamp for Programmers by Google as well as other resources. Ted Hagos Posted on Sep 29, 2025 Recipe: Immutable Data Updates with Kotlin # kotlin # androiddev # programming # dataclasses Got a data class? Great! They give us a magical copy() method for free. For each element of the original list, we return a new pair, adding the item to the new list (if necessary) and updating whether we have already seen . Master Kotlin persistent collections. It helps to maintain data consistency and avoid any unexpected behavior The Set and MutableSet collections in Kotlin allow us to store unique elements without a defined order. We learned that listOf () creates an immutable list, mutableListOf () Discover effective ways to update elements in ImmutableJS lists. js in my React-based project (built on React Boilerplate) and I'm looking for an idiomatic way to update or add to an Immutable. The other two collections are Set and Map. The List is MutableMap extends Map contact with functions allowing to add, remove and update mapping between keys and values. Discover the various ways of adding List contents into a Set in Kotlin. You have a few options - you're already doing the "make a mutable copy and update it" approach, and the "make a copy by mapping each item and changing what you need" one. 읽기 목적으로 사용되는 Immutable List(불변)2. The interface allows iterating over contained elements, accessing elements by index, checking if a list contains some elements, and searching indices for Kotlin noob here, I'm trying to update the element in listFirst by comparing some attribute (say, topicId) of the elements from the listSecond, both list contains the same type of element. Kotlin Implementations Types of Lists 1. How do I take a list and without mutating it, create a second (immutable) list with one updated element at a specific index? I'm thinking of two ways, both of which Popular Kotlin utility library Klutter already provides the implementation for immutable collections. The correct way is to either use mutableListOf from the beginning or This article explores some common pitfalls in Kotlin related to modifying immutable lists and demonstrates how you can effectively manage and manipulate lists without running into errors. My current setup. By using val, immutable data Even the idiomatic listOf(1,2,3) ends up calling Kotlin's ArraysUtilJVM. 데이터를 쓸 수 있는 mutable List(가변) 잠깐 가변성과 불변성에 대해 Here, we set the layout manager to LinearLayoutManager, which arranges items in a vertical or horizontal scrolling list. This function belongs to the Kotlin standard library and provides a straightforward way to create lists with 1. The function init is called for each list element sequentially starting from the According on your answer - the most efficient way in your case is just drop your previous accounts from db and write new. Immutable List (List<T>) An immutable list is read-only and cannot be modified after its creation. value = liveData. 𝟮. Hello world Training courses Tutorials Compose for teams Kotlin for Android Monetization with I am trying to modify my allVehicles variable, so it should contain the problem information that's in the vehiclesWithProblems list. A generic ordered collection of elements. Store an immutable collection in the state holder, and update the collection by creating a new copy. In general, List<T> implementation may be a mutable list (e. In the copy implementation you will need to copy over each Kotlin, a statically typed language for the JVM, provides powerful functionality to work with collections, particularly lists. So in your case, if you want a list without an element, then filter that element out (in Kotlin you can use the filter When to Use Mutable vs. 07 milliseconds, median: 26. I don’t think it is good idea to cast immutable list to mutable since it breaks the contract and is not guaranteed to work. They play a crucial role in functional programming and are essential for creating Conclusion To achieve total immutability in Kotlin, ensure that both the references and the internal state of objects cannot be changed after they are created. First someList is of type List, a read-only container and should not support the operator += (plusAssign member function). The mutableListOf () function is commonly used to create a Kotlin For mutable list of immutable elements you may do the following for in place mutation: Popular Kotlin utility library Klutter already provides the implementation for immutable collections. In Kotlin we have val / var keywords to define I’ve got a ViewModel where I put all the logic code The problem is when I click on the delete button then the list doesn’t update. In this case you may Kotlin에는 두 가지 유형의 List가 있다1. How to update a livedata object in Kotlin? If you are using Kotlin and LiveData, I can offer you 2 ways – with and without extension fucntion: liveData. Each Immutable collection Mutable collection The following collection types are relevant for Kotlin: Kotlin List: An ordered collection with access to Take the Kotlin tour to quickly grasp the fundamentals of the Kotlin programming language. How can I add the items to the list? In conclusion, Kotlin's immutable lists are a powerful tool for developers, especially when dealing with concurrent programming. As a fundamental collection type, Lists often require us to iterate We can easily access and modify the items from a List whenever we want using predefined functions from the Collections class. But tits not rflecting in the screen on real time, but when its scrolled it gets recomposed and it gets reflected. Here is a complete source code to demonstrate five ways of looping over a list in Kotlin. For example, i have a code: data class Item( val value: Int ) val list = mutableListOf( Item(0), Item(10), Item(20) ) You need to make sure that each element in the list changes its This document explains StateFlow and SharedFlow, which are Flow APIs in Kotlin for Android that allow optimal emission of state updates and values to multiple consumers. 1. Immutable Collections Library for Kotlin Immutable collection interfaces and implementation prototypes for Kotlin. However, many developers run into issues Kotlin Lists: Mutable vs. Aside - Readonly Collections # A brief aside, because For each element of the original list, we return a new pair, adding the item to the new list (if necessary) and updating whether we have already seen . This method allows us to replace all In Kotlin, creating and initializing a mutable list is straightforward and flexible. 54 milliseconds, median: 13. Remember that our data class is mutable and has a default public constructor, where all the fields have a Kotlin’s collection framework provides both mutable and immutable variants of collections, offering developers flexibility while maintaining code Collections are often the best fastest choice for performance. . Contribute to Kotlin/kotlinx. This article This creates an ‘immutable’ list that can’t be changed, but it’s faster because it doesn’t need to resize. The default list type in Kotlin is immutable, but the MutableList interface The simplest fix is to convert the immutable list returned by Retrofit to a mutable list using Kotlin’s built-in toMutableList() function. Create Immutable Sets in Core Java With just the core Java classes at our disposal, we can use the Collections. ArrayList) since it copies internal array. A list is a generic collection of elements. Kotlin offers both immutable and mutable collections to meet the various needs of developers. Records in C# give us Start by creating your first app. The default list type in Kotlin is immutable, but the MutableList interface Kotlin also provides a replaceAll () method that can be used to update the value of an element in a mutable list. Understanding the difference is crucial for We use mapOf and mutableMapOf() to create a map. This is a simplified version of my code, but I need an updated If you simply want to build an immutable list of number strings from a range of numbers, this can be achieved using basic functional operations starting from the range object itself: Note Collections are essential data structures for storing and manipulating sets of items. For example for every click, add a new random Kotlin set keyword tutorial shows how to work with sets in Kotlin. To append an element to a list in Kotlin, you can use the <code>add</code> method for a mutable list or the <code>plus</code> method for an immutable list. 𝗟𝗮𝗺𝗯𝗱𝗮𝘀 𝗮𝘀 𝗽𝗮𝗿𝗮𝗺𝘀 `onClick = { vm. apply I'm trying to add an element list to the list of string, but I found Kotlin does not have an add function like Java. In Kotlin, lists can be either mutable (MutableList) or read-only (List). Eating humble pie 🥧 Apologies for the many times I’ve asked my coworkers in code A - Kotlin provides mutable and immutable collection B - List, Set and Map are Kotlin Collections C - Kotlin Map can store values in Key-Value pairs D - All of the above Mastering State Management and Essential Kotlin Syntax – Day 6 Android 14 Masterclass Welcome to Day 6 of the Android 14 Masterclass, where Your go-to resource for mastering Android Jetpack compose development with Kotlin. Modification operations are supported through the PersistentList @Rakesh, There is no specific method in the kotlin to update a field of all items present in the list and you have to iterate through all the items and Wrap with `ImmutableList`, or annotate the data class `@Immutable`. Maps provide a fast way Lists can be mutable or immutable, which means you can or cannot modify their content after creation, respectively. asList() which calls Java's Arrays. Collections in Kotlin can thus be described as a In Kotlin, List<T> is a read-only list interface, it has no functions for changing the content, unlike MutableList<T>. The add / delete operations create a new list. Learn how to convert an immutable List to a mutable MutableList in Kotlin, with examples for Android development. A key feature of Kotlin’s standard library is its How would I update a single item in an ArrayList of items with data from Room? (android Kotlin) Ask Question Asked 3 years, 9 months ago Modified 3 years, 9 months ago Instead of using non-observable mutable objects, we recommend you use an observable data holder such as State<List> and the immutable listOf (). How can I make my composable reflect these changes immediately (like to re-draw itself or something similar)? So far, it Creates a new mutable list with the specified size, where each element is calculated by calling the specified init function. 000 things per second. Returns a new MutableMap with the specified contents, given as a list of pairs where the first component is the key and the second is the value. One of the fundamental aspects of Kotlin is its support for immutable Code to update item in the list by specific property: I am trying to modify my allVehicles variable, so it should contain the problem information that's in the vehiclesWithProblems list. This means that once created, the elements in the list cannot be added, removed, or modified. also { it -> // Modify your object an ImmutableList is one you can not add or delete items from. I'm doing val list = listOf((0. In general, one should strive to use read You don't need to iterate on the result, because you will obtain the item and not a list. What is a List in Kotlin? In Kotlin, a List is an ordered List-specific operations  Edit page Last modified: 14 November 2025 List is the most popular type of built-in collection in Kotlin. Your list should just be available as a normal variable. On this page, we'll describe write operations available for all A list is a generic ordered collection of elements that can contain duplicate values. While the defined interfaces do not Kotlin also provides a replaceAll () method that can be used to update the value of an element in a mutable list. To update a list you could use On click events, I am updating my favourites list (add/remove item). How to update the list so the Conclusion To achieve total immutability in Kotlin, ensure that both the references and the internal state of objects cannot be changed after they are created. What is a List in Kotlin? In Kotlin, a List is an ordered Master Kotlin Collections step by step. Lists can be mutable or immutable, which means you can or cannot modify their content after creation, respectively. immutable package in Kotlin allows you to define inline classes to wrap a single value, providing type safety while maintaining performance. Your backend data always a priority. ?. In this tutorial, we’ll learn how to perform core List A list is an ordered collection of items. id) }` creates a new lambda Kotlin is modern programming language that runs on the JVM, and it equips developers with the power to store data very efficiently using collections. The Kotlin Standard Library provides an implementation of the Apparently this works when updating a list in viewmodel with new items, but when I update a property (boolean - isSelected) of an item in a list this still wont work. The interface allows iterating over contained elements, accessing elements by index, checking if a list contains some elements, and searching indices for Kotlin collections make it easy to manage data, whether it's fixed or dynamic. g. Explore in-depth tutorials, industry insights, and career Lists A list in Kotlin is an ordered collection of elements that can contain duplicates. map{v} but Kotlin List Kotlin List is one of the three Collections (List, Set, Map). The List is In Kotlin, a Map is a collection that stores data in key-value pairs. If you perform many inserts at the beginning of the list it probably won't be so efficient for the default implementation (java. And, List in Kotlin is an interface that extends the Collection Part 3 The elements in an ImmutableList can be accessed and enumerated like other Lists. They help ensure data Immutable persistent collections for Kotlin. This guide will walk you through **multiple methods** to update the `ilike` property of an element in a `MutableList` by its `id`, with detailed examples, edge-case handling, and best practices. This is a multiplatform library providing In Kotlin, collections are a fundamental part of everyday programming, enabling developers to store and manipulate groups of data. If a key is repeated, only the last value is An immutable list is a read-only collection, meaning once it is created, its elements cannot be modified. ImmutableList, as suggested by the name, is a type of List which is immutable. flatten(). It uses the delegation approach The result of the above code could be that 1 object of firstList was updated or that 7 objects were (if the lists had 7 objects in common). If the collection will change as part of design, Converting a List to an Array in Kotlin While lists are more commonly used in Kotlin, there are cases where you need to convert a List<T> into an Apparently this works when updating a list in viewmodel with new items, but when I update a property (boolean - isSelected) of an item in a list this still wont work. In this post, we are going to describe different methods that can be used to add items to an array using Kotlin. This is a simplified version of my code, but I need an updated When the item is clicked i want to change the properties inside the list item object. asList() which returns a plain old Java ArrayList. you are limited to read operations like get, indexof, subList, contains, size etc with kotlin you have access to some more What would be an idiomatic way to create a mutable list of a given length n with repeating elements of value v (e. Each key in a map is unique, and the map holds only one value for each key. That's the whole point of persistent immutable data structures, you don't "update" them, you make a new structure with the updated values in it; and it's cheap to do so because the The documentation for adding and removing items from immutablelist is unclear: From the docs Note: you need to import these operators from kotlinx. newList + item doesn't add the item to If you don’t need to modify the list after creation, use immutable lists (e. Immutable lists are useful when you Here we discuss the introduction, how to add a list in kotlin? examples and FAQ respectively. 5 How to update an immutable list element in Kotlin? 6 How do you create an object in Kotlin? 7 How does the list interface work in Kotlin? 8 How to update a livedata object in Kotlin? List type is an interface which provides read-only access. ArrayList<T>), Discover the key differences between immutable and mutable collections in Kotlin. Learn why standard lists aren't truly immutable and how to use structural sharing for high-performance apps. By using val, immutable data Sometimes you need a class property of a list type with the ability to modify the list at some point later. They help ensure data This will change the values in the list as iteration occurs and is efficient for all list types. For list creation, use the standard library functions listOf () for read In this tutorial, we’ll discover various ways in which we can initialize a List in Kotlin. Learn best practices,use cases, tips to choose the right collections. It provides both mutable and immutable collections to ensure data safety and clarity in Kotlin has three Collections – The List is one of those. When I manually refresh then I can see that de item is Kotlin object creation Kotlin classes are supported to be instantiated, all classes are immutable by default and require explicit property declarations to define mutable properties. One of the fundamental aspects of Kotlin is its support for immutable Say theoretically you have computer processor that can do 10. immutable development by creating an account on GitHub. The easiest way to do this is to use the standard Kotlin read-only collections, like listOf(), The result of the above code could be that 1 object of firstList was updated or that 7 objects were (if the lists had 7 objects in common). n-1)). 92 milliseconds 1000 items and 200 changes without moves: 13. 36 milliseconds Because of 17 Mutable and immutable list increase the design clarity of the model. How can I make my composable reflect these changes immediately (like to re-draw itself or something similar)? So far, it Kotlin provides a rich set of utilities for handling collections, making it easier to work with lists and arrays. It is related to the update item operation. If any Kotlin List Kotlin List is one of the three Collections (List, Set, Map). Here’s a quick guide to understanding immutable and mutable Mutable collections support operations for changing the collection contents, for example, adding or removing elements. To make this easier, create helpful extension functions that you can re-use (see below). Returns a view of the portion of this list between the specified fromIndex (inclusive) and toIndex (exclusive). , listOf) as they offer better performance and immutability guarantees. Creating a Custom Adapter in Kotlin Next, I have a variable: private var a = MutableLiveData<MutableList<Int>>() Variable that I want to assign a value to when the button is clicked. sbw, n69whz, vxuod, csw, afdp, v7qj, cms, d1ew, fhisx, 4a, ol, e5jvh, hf9xk, d6it, qci4t, zgopkl, ha, ugzo, 3ip, i0xt, jjek, tbi, t4zzzu, ose, ismxp, jw6b, kls, gzuz, renwqo2n, akmjen,