indexOf(a. To search an element in a sorted list, call the binarySearch() function Sep 11, 2025 · Master Kotlin Collections step by step. So, you have a Pair of List s as a return value: the first list containing elements that match the predicate and the second one containing everything else from the original collection. Sep 17, 2020 · I want to sort a list by the elements of another list. So the second list should explicitly define the order of the resulting (ordered) list. Map. Jan 24, 2024 · Create, initialize, add item, get value, update, remove entries in a Kotlin HashMap - Iterate over a HashMap - Filter, transform a HashMap example Mar 19, 2024 · This article demonstrates how to convert a list of objects into a list of strings in Kotlin using various methods, including map(), mapNotNull(), mapTo(), mapIndexed(), for loops, and flatMap(). This release also brings tooling updates, performance improvements Kotlin is a modern statically typed programming language used by over 60% of professional Android developers that helps boost productivity, developer satisfaction, and code safety. Jul 15, 2023 · The same is available for maps with the functions mapOf() and mutableMapOf(). Sep 11, 2023 · Partition  Another filtering function – partition() – filters a collection by a predicate and keeps the elements that don't match it in a separate list. Whether you're interested in getting started with Kotlin or are looking to grow your expertise, Google's Kotlin for Android training courses can help you advance your skills. Dec 16, 2025 · The Kotlin 2. Collections are essential data structures for storing and manipulating sets of items. 3. On this page, we'll describe write operations available for all implementations of MutableCollection. equals should consider two maps equal if and only if they contain the same keys and values associated with these keys are equal. Jan 13, 2026 · Kotlin is a concise and multiplatform programming language by JetBrains. For more specific operations available for List and Map, see List-specific Operations and Map Specific Operations respectively. Jun 4, 2024 · In Kotlin, the transform function is an incredibly powerful tool to perform the list to map kotlin conversion. Kotlin lets you manipulate collections independently of the exact type of objects stored in them. It works significantly faster than other built-in search functions but requires the list to be sorted in ascending order according to a certain ordering: natural or another one provided in the function parameter. Mar 19, 2024 · Kotlin’s standard library comes with many useful APIs that allow us to generate Maps in very succinct ways. Apr 18, 2023 · Guide to Kotlin List to Map. Nov 14, 2025 · There is one more way to search elements in lists – binary search. Explore Kotlin and practice your coding skills on the Kotlin Playground! Simply type a snippet of code and click Run to try it on the fly. Otherwise, the result is undefined. It offers a smooth development experience, balancing simplicity and powerful capabilities to create reliable and scalable applications. Jan 21, 2021 · Plus and minus operators  Due to the key access to elements, plus (+) and minus (-) operators work for maps differently than for other collections. Dec 4, 2024 · In Kotlin, working with collections is a daily task you perform when you manipulate or manage data. Unlike some other equals implementations, Map. Standard library API reference Living essentials for everyday work with Kotlin: IO, files, threading, collections, and much more Kotlin is a modern, concise and efficient language developed by JetBrains, widely used in Android development and server-side applications. Jan 13, 2026 · Kotlin is a concise and multiplatform programming language by JetBrains. In this section, we describe some details about calling Java code from Kotlin. As of 2020, Kotlin was the most widely used language on Android, with Google estimating that 70% of the top 1,000 apps on the Play Store were written in Kotlin. Explore how List, Set, and Map work in Kotlin with real-world examples for beginners and advanced developers. plus returns a Map that contains elements of its both operands: a Map on the left and a Pair or another Map on the right. . equals should consider two maps equal even if they are instances of different classes; the only requirement here is that both maps have to implement Map interface. We believe other functionality that is missing from the standard runtime library can be developed as Kotlin Contributions under the Kotlin-X umbrella or as individual projects by community members. Kotlin is a modern, concise and efficient language developed by JetBrains, widely used in Android development and server-side applications. Press enter or click to view image in full Jun 22, 2022 · How to create Kotlin List, how to add, update, replace, remove items in mutable List, iterate over List, combine Lists, reverse, find items in Kotlin List .

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