How to return multiple values in Kotlin, with 0 allocation
when defines a conditional expression with multiple branches. It is similar to the switch statement in C-like languages. Its simple form looks like this. when (x) { 1 -> print("x == 1") 2 -> print("x == 2") else -> { print("x is neither 1 nor 2") } }
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Enum classes in Kotlin have synthetic properties and methods for listing the defined enum constants and getting an enum constant by its name. The signatures of these methods are as follows (assuming the name of the enum class is EnumClass ):
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We could approach this problem by writing two different functions: Kotlin fun positiveRoot (k: Int): Double { require (k >= 0) return Math.sqrt (k.toDouble ()) } fun negativeRoot (k: Int): Double { require (k >= 0) return -Math.sqrt (k.toDouble ()) } Another approach might be to return an array so we only have to invoke one function: Kotlin
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Kotlin Basics 1. Overview As we've known, we can declare and assign multiple variables in one single line in Java. In this tutorial, we'll explore how to do the same in Kotlin. 2. Introduction to the Problem Like Java, we can declare and assign multiple variables in one line. In this tutorial, we'll addresses approaches to do that:
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The Kotlin standard library provides extension functions for grouping collection elements. The basic function groupBy () takes a lambda function and returns a Map. In this map, each key is the lambda result and the corresponding value is the List of elements on which this result is returned.
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This article covers different ways to return multiple values from a function in Kotlin. 1. Using Data class The idiomatic way of returning multiple values from a function is to define your data class and return its instance from the function. Then you can unpack values using destructuring declaration inside the caller function. 1 2 3 4 5 6 7 8 9 10
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When we want to return multiple things, we put it into a container: a class. However, that approach has 2 caveats: Requires extra allocation. Requires naming the class. If the code is not called at high frequency (many times per second), and not in UI, the first caveat should not be a concern. However, the second caveat means that in addition.
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Mar 7. When dealing with multiple values in Kotlin, there are several options available. In this post will look at List, Sequence, and Flow. In order to have a better understanding of these 3 options and how they differ we will define a hypothetical problem and try to refine our solution until we reach the desired outcome.
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Multiple values can be represented in Kotlin using collections. For example, we can have a simple function that returns a List of three numbers and then print them all using forEach: xxxxxxxxxx fun simple(): List
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1. Overview In Kotlin, let () is a pretty convenient scope function. It allows us to transform the given variable to a value in another type. In this tutorial, we'll explore how to apply let -like operations on multiple variables. 2. Introduction to the Problem First of all, let's look at a simple let example:
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You can multiply as many numbers in a single expression as you would like by chaining the Multiplication operator. Examples Multiplication of 4 and 6 In the following program, we take two variables: n1, and n2 with the values 4 and 6 respectively; and find their product. Kotlin Program
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Kotlin has many different utilities and helper functions for sorting collections. These utilities are also equipped for dealing with multiple fields at once. Significantly, they come into play when we can't add the interface to the target class or we want a variety of sorting options. 3.1. Use sortedWith and compareBy
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Allow assigning the same value to multiple targets at once. Language Design. oakkitten September 23, 2020, 1:43am 1. It would be nice to have this syntax: a = b = 1. which would be equivalent to. 1.let { a = it b = it } This doesn't require turning assignment into an expression, but could be a special case of several = in a row.
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1. Overview In this tutorial, we're going to learn how to return multiple values from a Kotlin function. In the first two sections, we'll briefly talk about tuples and destructuring declarations in Kotlin. Then we'll use these declarations to return multiple values from a function. 2. No Tuples in Kotlin
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There are two things to notice when using when as an expression in Kotlin. First, the value that is returned to the caller is the value of the matching case block or, in other words, the last defined value in the block. The second thing to notice is that we need to guarantee that the caller gets a value.
Kotlin When Multiple Values? 15 Most Correct Answers
4 Answers Sorted by: 123 You're missing the other is: fun applyTemplateViewStyles (view: View) { when (view) { is EditText, is TextView -> { println ("view is either EditText or TextView") } else -> { println ("view is something else") } } } Share Follow edited Jun 2, 2017 at 21:13 answered May 20, 2017 at 13:58 Daniel Storm 18.6k 9 84 152
