Written by: baeldung Reviewed by: Brandon Ward Kotlin Collections Sorting 1. Overview In Object-Oriented programming languages, we need to sort a collection of objects from time to time. And sometimes, we may need specific sorting logic that can sort on multiple fields of the objects. In...
Sort collection by multiple fields in Kotlin - A Collection is an object where developers can group different types of related objects in one place. There are different kinds of collections present in Kotlin library such as List, Array, etc.In this artic
2. Usingsort()function To sort a list of objects against the multiple fields, the class can implement theComparableinterface and override its abstract functioncompareTo()to define the position of an object relative to another object. The following example demonstrates this by sorting a list ofMovi...
Collections have a standard series of functions to sort and manipulate them, such as sort, or first. They are quite obvious and we are not going to see them one by one. However, we are going to see the most powerful and Kotlin-specific functions later in the advanced section. Lists 代码...
How to Sort a Collection Using Multiple Fields in Kotlin Kotlin Keyword How to Use the with Keyword in Kotlin Differences Between val and var in Kotlin Difference Between Open and Public Keywords in Kotlin How to Use the by Keyword in Kotlin ...
Android is a mobile operating system (OS) that was designed and developed by Google The Android OS is Linux kernel-based So, what’s “Linux kernel,” and why is that such an essential detail about Android Development? In a nutshell, Linux kernel is an OS, well, sort of — it’s ...
Androidis a mobile operating system (OS) that was designed and developed by Google. TheAndroid OSis Linux kernel-based. So, what’s “Linux kernel,” and why is that such an essential detail aboutAndroid Development? In a nutshell, Linux kernel is an OS, well, sort of — it’s ...
As we mentioned, you can use Kotlin on multiple platforms and in different ways. If you are still unsure if you want to develop with Kotlin you can start with the online development environment: Try Kotlin. It comes with a few exercises to get the feel of the language. ...
So a complex operation such as a filters, a sort and a transformation can be quite explicitly defined: 1 2 3 4 parsedContacts .filter { it.name != null && it.image != null } .sortedBy { it.name } .map { Contact(it.id, it.name!!, it.image!!) } We can define new immutable...
If the compareTo() implementation works on numeric fields, we may be tempted to implement the function by subtraction, something like: class Version(val value: Int): Comparable<Version> { override fun compareTo(other: Version): Int = value - other.value } Please don’t do this. For some...