In this tutorial, we will customize our ListView. These are some important points you should know before working with Kotlin MutableList: List is read-only (immutable), you cannot add or update items in the original list. 1. isNullOrEmpty() function From Kotlin 1.3 onwards, the recommended approach is to use isNullOrEmpty() method to check for an empty or null list in Kotlin. Kotlin List.isEmpty() Function. If list is null, instead of returning null, you return an empty List, which still adheres to the contract. Dynamic array states that we can increase or decrease the size of an array as per requisites. They are created using constructor keyword. This article explores different ways to initialize an empty List in Kotlin. We can invoke the filter() method directly on the list (no stream() like in Java 8 required). Destructuring Declarations in Kotlin. 26. Kotlin Function Arguments 05:50. A point about null pointers. How to check if a number is positive, negative or zero in Kotlin. This article explores different ways to check for a null or empty List in Kotlin. 1. isNullOrEmpty() function. Kotlin Single Line Expressions 04:08. List is immutable, so, you cannot update individual elements of list or add items to the original list. LinkedList Constructor. 24. 5 different Kotlin program to iterate through a mutablelist. Kotlin Functions inside of other Functions 03:02. GREPPER; SEARCH SNIPPETS; PRICING; FAQ; USAGE DOCS ; INSTALL GREPPER; Log In; All Languages >> Kotlin >> kotlin array operations “kotlin array operations” Code Answer . As with previous approaches, this can be rewritten as: Finally if you need a LinkedList implementation of the List interface, you can use the LinkedList constructor to get an empty mutable instance of a linked list. How to read user input in Kotlin . Kotlin MutableList (mutableListOf()) Kotlin MutableList is an interface and generic collection of elements. Kotlin Function Arguments 05:50. str2 is null or empty. It is immutable and its methods supports only read functionalities. str2 is null or empty. javascript by RosiePuddles on May 23 2020 Donate . Kotlin program to print each character of a string (4 different ways. Best Guidelines, Kotlin Android Tutorial - Learn Android Development with Kotlin, Salesforce Visualforce Interview Questions. Which means the size of ArrayList class can be increased or decreased according to requirement. Alternatively, you can write it as following to improve readibility: You can use the ArrayList constructor to get an empty ArrayList instance of the List interface. Supported and developed by JetBrains. Here, you added safe call operators. A list is empty if and only if it contains no elements. It is super easy. is used for safe type casts 3. break terminates the execution of a loop 4. class declares a class 5. continue proceeds to the next step of the nearest enclosing loop 6. do begins a do/while loop(loop with postcondition) 7. else defines the branch of an if expressionwhich is executed when the condition is false 8. false specifies the 'false' value of the B… The original list is not changed. 5 different ways in Kotlin to find a string in a list of strings . 23. Important points about Kotlin List & MutableList. Finally if you need a LinkedList implementation of the List interface, you can … Elvis operator is used to removing null pointer exception in Kotlin. kotlin by Noob_Code on Oct 29 2020 Donate . What is elvis operator in Kotlin. Kotlin Elvis Operator (? Grepper. An Adapter class is used to add the list items in the list. 101. If you need an ArrayList implementation of list, consider using the arrayListOf() function. Note that the reference is immutable, but the list itself is … It is called joinToString. The following tokens are always interpreted as keywords and cannot be used as identifiers: 1. as 1.1. is used for type casts 1.2. specifies an alias for an import 2. as? kotlin size of array . :) Example. The declaration can be further shortened to: To get a mutable list, you should use the mutableListOf() function. 1. isNullOrEmpty () function From Kotlin 1.3 onwards, the recommended approach is to use isNullOrEmpty () method to check for an empty or null list in Kotlin. Kotlin Elvis Operator example. Kotlin but also Groovy or C#. Output: Length of str is -1 Length of str2 is 30 As Kotlin throw and return an expression, they can also be used on the right side of the Elvis operator. 1. * fun main (args: Array) { //sampleStart val nullArray: Array? ... Name can't be empty. Home ... 19. NoSuchElementException - if the list is empty. There are several ways to initialize an empty list as discussed below: 1. listOf() function. Please note that the right side expression will only be called if the left side expression is null. Instead, Kotlin adds the concept of an extension function which allows a function to be "glued" onto the public function list of any class without being formally placed inside of the class. 03, Dec 20. If you need an immutable empty list instance, you can use listOf() function as shown below. var a: String? In Kotlin, we can declare variable which can hold null reference. There are several ways to initialize an empty list as discussed below: If you need an immutable empty list instance, you can use listOf() function as shown below. activities. This time, you should be able to traverse all the directories without the app crashing! Kotlin™ is protected under the Kotlin Foundation and licensed under the Apache 2 license. How to Copy and Add all List Elements to an Empty ArrayList in Java? The same practice led me t o use joinToString() Kotlin method to reduce my for loop usage to create a list of comma separated “string” values to be passed in a SQLite query. Read more about the Elvis operator in the Kotlin documentation. Binary search implementation in Kotlin for a list of custom objects. 21. 3. Kotlin provides one method to do that easily. Output: Length of str is -1 Length of str2 is 30 As Kotlin throw and return an expression, they can also be used on the right side of the Elvis operator. In Kotlin? Micah McGee. What is elvis operator in Kotlin. Kotlin Secondary Constructor. In this post, I will show you how we can convert one list to string in Kotlin … ... Partition a list in kotlin : Partitioning or dividing a list or any other collection is easy in Kotlin. 24. Kotlin | Retrieve Collection Parts. MutableList interface is mutable in nature. Learn Named argument in Kotlin with examples. ArrayList class provides both read and write functionalities. For example, if array A holds 1,2,3,4,5 and array B holds 2,5,6, the intersection between A and B will be 2,5.In this tutorial, we will learn how to find out the intersection between two array elements. Kotlin List is an interface and generic collection of elements. 0 Source: stackoverflow.com. Kotlin's type system is aimed at eliminating the danger of null references from code, also known as the The Billion Dollar Mistake.One of the most common pitfalls in many programming languages, including Java, is that accessing a member of a null reference will result in a null reference exception. How to Create a Function in Kotlin 05:41. How to intersect two array elements in Kotlin : The intersection is used to find out the common elements in two arrays. println(str == null || str.isEmpty()) // true. Alternatively, you may wish to prefer immutability, and declare it as: var listOfVehicleNames: List = emptyList() And in your completion block, simply reassign it: import kotlin.test. import kotlin.test. If you want to reverse a list in Kotlin. Read more about the Elvis operator in the Kotlin documentation. ArrayList class is used to create a dynamic array in Kotlin. Kotlin Elvis Operator 02:01. Line 45 of FileHelpers.kt file, listFiles() returns null when file is not a directory. Kotlin supports nullability as part of its type System. We can use it to check if any variable is null or not and it allows us to use one default value if the value is null.The syntax of elvis operator is ?. 22. Public Private Cancel. A list is empty if and only if it contains no elements. In this Kotlin Tutorial, we learned how to check if a list is empty or not, using Kotlin List.isEmpty() function. Kotlin Single Line Expressions 04:08. www.tutorialkart.com - ©Copyright-TutorialKart 2018, Kotlin - Class, Primary and Secondary Constructors, Kotlin - Primary Constructor call expected, Kotlin - Null can not be a value of a non-null type String, Kotlin - Cannot create an instance of an abstract class, Kotlin - Iterate through all files in a directory, How to Learn Programming? In this post, I will show you how to do partition using and without using the provided function. It returns the true if list is empty, otherwise false. Returns an empty read-only list. To check for null as well, it should be preceded by a null check. How to read user input in Kotlin. Kotlin List is one of the three Collections (List, Set, Map). Android provides a facility to customize the ListView. 20. Kotlin Elvis Operator 02:01. In the previous tutorial Kotlin Android ListView, we have created an example of default ListView. 07, May 19. Kotlin ArrayList class. Kotlin Named Parameters in Functions 04:25. private val users = mutableListOf() We also changed var into val because users will contain an immutable reference to the list of users. List.isEmpty() function returns true if the collection is empty (contains no elements), false otherwise. How to convert a string to Date in Kotlin. Bewertung: 5 Kontakt. mutableListOf() creates an empty list that can hold User objects. Kotlin Android Custom ListView. Kotlin provides one inbuilt method that makes it easier for us. So when we need to access value of a, then we need to perform safety check, whether it contains value or not. Three different ways to create an empty string array in Kotlin. Returns an empty read-only list. If i understood it correctly then he is asking for best way to check null in Kotlin, not which approach generates best byte-code. Create. Idiomatischen Umgang mit null-Werte zulässt oder leere Liste in Kotlin. Do NOT follow this link or you will be banned from the site. In the above program, we've two strings str1 and str2. Kotlin Named Parameters in Functions 04:25. Don't use myString == "", in java this would be myString.equals("") which also isn't recommended.. isBlank is not the same as isEmpty and it really depends on your use-case.. isBlank checks that a char sequence has a 0 length or that all indices are white space.isEmpty only checks that the char sequence length is 0. Example. Nullable … Sagen, dass ich eine variable activities Typ List?. Enter your email address to subscribe to new posts and receive notifications of new posts by email. abstract fun iterator(): Iterator It returns an iterator over the elements of this list. 07, May 19. Since the data type of the variable can now be inferred by the compiler, remove the explicit type declaration of the users property. 20. Do this by adding the type in angle brackets right after mutableListOf or listOf. Contributing to Kotlin Releases Press Kit Security Blog Issue Tracker. If there is no data then I simply have an empty list. Suppose we have a nullable reference a, we can say "if a is not null, use it, otherwise use some non-null value x" var a: String? Get code examples like "kotlin array operations" instantly right from your google search results with the Grepper Chrome Extension. Supported and developed by JetBrains. If you really love NullPointerExceptions, Kotlin … Important points about Kotlin List & MutableList. val evenList = list. = "Nullable String Value" Now, a can be null. What is elvis operator in Kotlin. 25. Kotlin vs C#. 4. fun main() {. Hello World program in Kotlin. 0. ... Three different ways to create an empty string array in Kotlin. Secondary constructors are not that common in Kotlin. Please note that the right side expression will only be called if the left side expression is null. In this tutorial, we will go through syntax and examples for List.isEmpty() function. Kotlin streamlines this with the Elvis operator, ?:. Wir Beantworten Alle Ihre Fragen. Creating a New Kotlin List from an Existing Kotlin List Caster.io. 6 ways to add items to a list in Kotlin. 22. Safe call operator in Kotlin with example . : operator is sometimes called the "Elvis operator," because it's like a smiley on its side with a pompadour hairstyle, the way Elvis Presley styled his hair. It also provide read and write functionalities. That means You have the ability to declare whether a variable can hold a null value or not. str1 is null or empty. Kotlin Elvis Operator 02:01. In the above program, we've two strings str1 and str2. 25. These are some important points you should know before working with Kotlin MutableList: List is read-only (immutable), you cannot add or update items in the original list. How to sort a kotlin map by value. Get code examples like "convert array list to mutable arrray list kotlin" instantly right from your google search results with the Grepper Chrome Extension. @BenitoBertoli answer looks promising, it's reduces boilerplate code – imGs Dec 1 '17 at 12:30 kotlin read input as int . Learn Named argument in Kotlin with examples. How to check if a number is positive, negative or zero in Kotlin. Note: The ? : operator is sometimes called the "Elvis operator," because it's like a smiley on its side with a pompadour hairstyle, the way Elvis Presley styled his hair. = null println (nullArray.orEmpty ().contentToString ()) // [] val array: Array? 21. The returned list is serializable (JVM). The Kotlin List.isEmpty() function checks if the list is empty or not. Kotlin™ is protected under the Kotlin Foundation and licensed under the Apache 2 license. Annotationsverarbeitung mit Kotlin Annotations Grundlegende Syntax Grundtypen Java-Code von Kotlin aufrufen JavaScript aus Kotlin aufrufen Aufruf Kotlin aus Java Aufruf von Kotlin aus JavaScript Klassen und Vererbung Kodierungskonventionen Sammlungen: Liste, Set, Map Vergleich mit Java Programmiersprache Compatibility Compiler-Plugins Kontrollfluss: wenn, wann, für, während … ArrayList may contain duplicates and is non-synchronized in nature. By supporting nullability in the type system, the compiler can detect possible NullPointerException errors at compile time and reduce the possibility of having them thrown at runtime. Ich kam auf folgende Lösung: when {activities != null &&! Wenn die Liste nicht null und nicht leer ist, möchte ich etwas tun, sonst will ich etwas anderes tun. Kotlin’s collection API also returns a new read-only list. val str = "". This article explores different ways to check if a string is empty or null in Kotlin. We are assigning default blank values to to attributes. In Kotlin, a class can also contain one or more secondary constructors. Example. str1 contains null value and str2 is an empty string. list.isEmpty() Return Value. abstract fun lastIndexOf(element: E): Int: It returns the index of last occurrence of specified element in the list, or return -1 if specified element is not present in list. Kotlin ArrayList class is used to create a dynamic array. For example, if you write listOf("noodles"), Kotlin infers that you want to create a list of String. A point about null pointers. List is a collection of elements whose position in the collection is preserved, whereas in Set or Map, there is no fixed position/index for an element. The returned list is serializable (JVM). This article explores different ways to initialize an empty List in Kotlin. The List interface inherits form Collection class. How to convert a string to Date in Kotlin. Kotlin streamlines this with the Elvis operator, ?:. 23. When you initialize an empty list without elements, Kotlin cannot infer the type of the elements, so you have to explicitly state the type. The methods of MutableList interface supports both read and write functionalities. (Elvis-Betreiber) 2021; Das Autorenteam. Syntax of List.isEmpty() The syntax of List.isEmpty() function is. how to get char input in kotlin . ; MutableList inherites List and supports read/write access, you can add, update or remove items. To use the List interface we need to use its function called listOf(), listOf(). The size of the list is: 5 The index of the element USA is: 2 The element at index 4: Spain The first element is: Pakistan The last element is: Spain Check if the list is empty: false Reverse the list values. In this example, we will take an empty list, and check if it is empty or not programmatically. This is the culprit of the crash. Returning a value from a Kotlin Function 05:20. In Java this would be the equivalent of a NullPointerException or NPE for short.Kotlin's type system is aimed to eliminate NullPointerException's from our code. The standard approach in Kotlin to check for a null or an empty … How to Create a Function in Kotlin 05:41. The Elvis operator will evaluate the left expression and will return it if it’s not null else will evaluate the right side expression. str1 contains null value and str2 is an empty string. Learn Named argument in Kotlin with examples. Returns the array if it's not null, or an empty array otherwise. Kotlin list : listOf() 08, Aug 19. Since the data type of the variable can now be inferred by the compiler, remove the explicit type declaration of the users property. It inherits form Collection class. 17, Sep 19. filter {it % 2 = = 0} Please also note the compact API and lambda syntax. kotlin by Open Opossum on Jul 21 2020 Donate . Notify of new replies to this comment - (on), Notify of new replies to this comment - (off). The Elvis operator is part of many programming languages, e.g. mutableListOf() creates an empty list that can hold User objects. Returning a value from a Kotlin Function 05:20. ; MutableList inherites List and supports read/write access, you can add, update or remove items. Note that, since throw and return are expressions in Kotlin, they can also be used on the right-hand side of the Elvis operator. In certain computer programming languages, the Elvis operator? kotlin documentation: Null Coalescing / Elvis Operator. In Kotlin, we can declare variable which can hold null reference.Suppose we have a nullable reference a, we can say "if a is not null, use it, otherwise use some non-null value x". Accessing properties is very familiar in programming languages that support object-oriented paradigms. Kotlin ArrayList class follows the sequence of insertion order. I find the Wikipedia definition pretty accurate:. = arrayOf ('a', 'b', 'c') println (array.orEmpty ().contentToString ()) // [a, b, c] //sampleEnd } Kotlin Elvis Operator example. We've also created a function isNullOrEmpty() which checks, as the name suggests, whether the string is null or empty. 02, Aug 19. Example 1: Check if List is Empty str1 is null or empty. val listOfVehicleNames: MutableList = mutableListOf() And add to it that way. Kotlin Data Types. Kotlin also provides a number of such approaches, and lazy initialization with by … Alternatively, you can use isEmpty () function to check for an empty string in Kotlin. = "Nullable String Value" Now, a can be null. 20. The Kotlin List.isEmpty() function checks if the list is empty or not. 21. Sometimes it is desirable to evaluate a nullable expression in an if-else fashion. If you really love NullPointerExceptions, Kotlin … The Kotlin List.isEmpty() function checks if the list is empty or not. This article explores different ways to check for a null or empty List in Kotlin. Enabling Kotlin. * fun main (args: Array) { //sampleStart val list = listOf () println ("list.isEmpty () is $ {list.isEmpty ()}") // true // another way to create an empty list, // type parameter is inferred from the expected type val other: List = emptyList () // Empty lists are equal println ("list == other is $ {list == other}") // true println … Kotlin program to reverse a string recursively. We've also created a function isNullOrEmpty() which checks, as the name suggests, whether the string is null or empty. Here is how you can declare a Collection of Nullable Types in Kotlin - val listOfNullableTypes: List = listOf(1, 2, null, 3) // Works To filter non-null values from a list of nullable types, you can use the filterNotNull() function - val notNullList: List = listOfNullableTypes.filterNotNull() 2. The Elvis operator will evaluate the left expression and will return it if it’s not null else will evaluate the right side expression. Note: The ? How to Create a Function in Kotlin 05:41. In this example, we will take a list with some elements, and check if the list is empty using isEmpty() function. So when we need to access value of a, then we need to perform safety check, whether it contains value or not. This method doesn't exist in the read-only interface of Kotlin's list. “how to store user input into an array in android kotlin” Code Answer . Returning a value from a Kotlin Function ... Filter a list for Not Null Values in Kotlin with filterNotNull 01:15. 27. Safe call operator in Kotlin with example. Yeah we are using Kotlin so we’ve gotta add it as a dependency. Hence, elements in a list can be accessed using index. Compare the syntax of Kotlin and C# through short code examples. Kotlin Functions inside of other Functions 03:02. List.isEmpty() function returns true if the collection is empty (contains no elements), false otherwise. What is elvis operator in Kotlin. Kotlin provides one inbuilt method that makes it easier for us. Kotlin program to print each character of a string (4 different ways. Kotlin program to reverse a string recursively. Supported and developed by JetBrains Supported and developed by JetBrains 2. Kotlin Default Arguments 04:30. private val users = mutableListOf() We also changed var into val because users will contain an immutable reference to the list of users. Build and run the app. In the Kotlin data object, we’ve used what is called an elvis operator. Converting one list to string in Kotlin is easy. You really love NullPointerExceptions, Kotlin … Kotlin Android tutorial - Learn Android with. Then he is asking for best way to check if list is immutable, so, you can,... To use its function called listOf ( ) which checks, as the name suggests, whether contains.: 1. listOf ( ) returns null when file is not a directory collection is empty ( no! Mutablelistof ( ) function also contain one or more secondary constructors further shortened to: to a... Since the data type of the variable can hold a null or empty list in to! To initialize an empty list that can hold null reference as per requisites null || str.isEmpty ( ) function and. Is no data then I simply have an empty list, you use... Can … Kotlin Elvis operator is part of its type System of list, consider using the arrayListOf ). Intersection is used to create an empty list in Kotlin of a string Date! Etwas tun, sonst will ich etwas tun, sonst will ich etwas anderes tun to intersect two elements... Certain computer programming languages, e.g number is positive kotlin elvis empty list negative or zero in Kotlin should preceded... The declaration can be null is immutable, but the list ( no stream ( creates. String to Date in Kotlin, we will take an empty … Kotlin Elvis operator is of... Kotlin supports nullability as part of many programming languages, e.g well, it should be able to all! If and only if it 's not null Values in Kotlin ways in Kotlin tun. Original list the common elements in two arrays ) ) // [ ] val array: array Any..., listFiles ( ).contentToString ( ) method directly on the list items in the interface! … get code examples { activities! = null & & called listOf ( `` ''. Nicht null und nicht leer ist, möchte ich etwas tun, sonst will ich etwas tun sonst... To create an empty array otherwise Learn Android Development with Kotlin, can. Asking for best way to check for null as well, it should be preceded by a or... // [ ] val array: array < string > = mutableListOf ).: check if a list of string this with the Grepper Chrome Extension 0 } please also the! This article explores different ways you return an empty array otherwise for best way to check if a is... Only if it kotlin elvis empty list no elements ), false otherwise the array if it contains value or not properties! Check for a null or empty list, you can add, update or items. Filter { it % 2 = = 0 } please also note the compact API and lambda syntax a. In this Kotlin tutorial, we can declare variable which can kotlin elvis empty list a or! Implementation in Kotlin find out the common elements in a list can be further shortened to: to a. This tutorial, we 've also created a function isNullOrEmpty ( ) the syntax List.isEmpty., it should be preceded by a null value or not, using Kotlin List.isEmpty ). = mutableListOf ( ) null or empty google search results with the Elvis operator,?: if list immutable... ( args: array < Char >? empty ArrayList in Java 8 required ) a class can be using. Then I simply have an empty string or dividing a list of Custom....: check if a number is positive, negative or zero in Kotlin User (., it should be able to traverse all the directories without the app crashing I. Salesforce Visualforce Interview Questions nullable string value '' Now, a class can contain. Without using the provided function to attributes be inferred by the compiler remove. The read-only interface of Kotlin and C # through short code examples like `` array. Empty LinkedList Constructor or Any other collection is easy in Kotlin Press Kit Security Issue. An Existing Kotlin list Caster.io remove items, a can be null the syntax of List.isEmpty ( ) as! Interface of Kotlin 's list, listFiles ( ) returns null when file is not directory! Zero in Kotlin kam auf folgende Lösung: when { activities! = &. Will take an empty list in Kotlin implementation of the users property ich etwas anderes.! Take an empty list, and check if it is immutable,,! Arraylist in Java 8 required ) `` nullable string value '' Now, can! By the compiler, remove the explicit type declaration of the list empty! > ) { //sampleStart val nullArray: array < Any >? a variable can hold User objects file... Ve used what is called an Elvis operator,?: Partition a list in Kotlin customize our.... Methods of MutableList interface supports both read and write functionalities generic collection of.... Nullarray: array < string > = mutableListOf ( ) function shortened to to. Created an example of default ListView Kotlin ArrayList class is used to find out the common elements in,! Mutablelistof or listOf below: 1. listOf ( ) function returns true if the list is or. Binary search implementation in Kotlin: Partitioning or dividing a list of string an Adapter is... Zero in Kotlin with filterNotNull 01:15 computer programming languages, e.g is immutable but! Empty list that can hold null reference take an empty list in Kotlin please also note the API... In a list is empty if and only if it is immutable, so, you can not individual. Provided function adheres to the original list variable can Now be inferred by the compiler remove... To create an empty list instance, you can … Kotlin list is empty LinkedList Constructor reverse a in. If there is no data then I simply have an empty … Android. String value '' Now, a can be increased or decreased according to requirement you will banned... For best way to check for null as well, it should be preceded by a null or empty sonst. List itself is … note: the intersection is used to add items to the contract support paradigms... Returns null when file is not a directory iterator < E > ( ) creates an empty in... The read-only interface of Kotlin and C # through short code examples read and write functionalities take an …... Learned how to check for a null or empty list in Kotlin increase or decrease the size of ArrayList can. In the Kotlin data object, we ’ ve used what is called an Elvis operator example:. Is called an Elvis operator checks, as the name suggests, whether the is. This method does n't exist in the Kotlin Foundation and licensed under the Apache 2 license we 've two str1! Null & & you can … Kotlin Android tutorial - Learn Android Development with,. C # through short code examples like `` Kotlin array operations '' instantly right your! C # through short code examples the ability to declare whether a variable can Now be by! Or remove items list and supports read/write access, you can add, update or items. Created a function isNullOrEmpty ( ) creates an empty list instance, you can … Kotlin is... And licensed under the Apache 2 license secondary constructors Kotlin MutableList ( (! Class can also contain one or more secondary constructors insertion order, if you need an empty! Above program, we learned how to convert a string ( 4 different ways to initialize an list! A dynamic array in Kotlin languages that support object-oriented paradigms, a can be null like in Java of. Kotlin is easy in Kotlin … Important points about Kotlin list &.... Nicht null und nicht leer ist, möchte ich etwas anderes tun programming languages, e.g Kotlin object. Then I simply have an empty list posts by email not a kotlin elvis empty list a... Checks, as the name suggests, whether the string kotlin elvis empty list null, instead of returning null, you add... Or decrease the size of an array as per requisites with filterNotNull.... Its type System you have the ability to declare whether a variable can hold a or... Val listOfVehicleNames: MutableList < string > ) { //sampleStart val nullArray: array Char... Preceded by a null value and str2 a null or an empty string array in Kotlin Partitioning... Inferred by the compiler, remove the explicit type declaration of the three Collections ( list and! Follows the sequence of insertion order our ListView is an empty list that can hold User objects //sampleStart... Type in angle brackets right after mutableListOf or listOf ) ) // [ ] val array:
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