# Dave Leeds on Kotlin - typealias.com Recent content about Kotlin programming on typealias.com This is one page of public article previews, not the complete archive. Follow Next page to continue. Summaries are not the original full articles. ## Coroutine Essentials DevFeed: [Coroutine Essentials]() Original publisher: [Read original article]() Author: author@typealias.com (Dave Leeds) Published: 2026-08-21T00:00:00Z Content type: tutorial Language: en Sources: [Dave Leeds on Kotlin - typealias.com]() Topics: [Coroutines](), [Kotlin](), [coding](), [Software]() Tags: [async](), [cancellation](), [coding](), [concurrency](), [coroutine](), [coroutines](), [deferred](), [dispatcher](), [exception-handling](), [introduction](), [job](), [kotlin](), [launch](), [learn-to-program](), [parallelism](), [programming](), [runblocking](), [software](), [structured-concurrency](), [suspend-function](), [withcontext](), [yield]() ### AI overview This tutorial introduces essential Kotlin coroutine concepts for performing multiple tasks concurrently, such as making network calls while updating a screen. It aims to provide a foundation for day-to-day coding and more advanced coroutine concepts. ### Source excerpt When you're on hold during a phone call, you might also check your email. While brewing coffee, you might also cook breakfast. And while driving a car, you might listen to a podcast. In the same way, sometimes it's helpful for the software that we write to do more than one thing at a time. For example, it could make two or three network calls at one time--all while updating the screen to show the progress of each call. ## How to Prevent Race Conditions in Coroutines DevFeed: [How to Prevent Race Conditions in Coroutines]() Original publisher: [Read original article]() Author: author@typealias.com (Dave Leeds) Published: 2025-11-24T00:00:00Z Content type: tutorial Language: en Sources: [Dave Leeds on Kotlin - typealias.com]() Topics: [Coroutines](), [kotlin-coroutines](), [Kotlin](), [Concurrency]() Tags: [actor](), [atomicint](), [atomics](), [concurrency](), [coroutine](), [coroutines](), [how-to](), [kotlin](), [kotlin-coroutines](), [limitedparallelism](), [mutex](), [programming](), [race-condition](), [shared-mutable-state](), [state](), [stateflow](), [structured-concurrency]() ### AI overview This tutorial explains that Kotlin coroutines and structured concurrency do not automatically protect shared mutable state from race conditions. It introduces the issue using an example that creates 100,000 random bakery orders. ### Source excerpt Thanks to structured concurrency, there are a lot of concerns that we don't have to handle manually when working with Kotlin coroutines. For example, parent coroutines automatically wait for their children to complete before completing themselves. And when a parent coroutine is cancelled, its children are automatically cancelled, too. But when it comes to shared mutable state - mutable data that multiple coroutines could update at the same time - there's nothing magical in the design of coroutines to ensure that the state is updated properly. ## Generic Variance DevFeed: [Generic Variance]() Original publisher: [Read original article]() Author: author@typealias.com (Dave Leeds) Published: 2024-04-23T00:00:00Z Content type: tutorial Language: en Sources: [Dave Leeds on Kotlin - typealias.com]() Topics: [generics](), [Kotlin](), [interfaces]() Tags: [advanced-kotlin-concepts](), [contravariance](), [covariance](), [extend](), [generic-variance](), [generics](), [implement](), [interfaces](), [introduction](), [kotlin](), [kotlin-generics](), [kotlin-type-safety](), [learn-to-program](), [programming](), [programming-language-type-systems](), [software-development](), [subtyping-in-kotlin](), [type-parameters]() ### AI overview A tutorial on variance in Kotlin generic types. It explains how covariance and contravariance affect subtype relationships between parameterized types, using examples to show when one generic type can substitute for another. ### Source excerpt We've seen how we can implement interfaces and extend classes to create subtypes. However, with generic types, we sometimes want to create a subtype based on the type arguments instead of the base types. Kotlin gives us a few different tools to achieve this, and in this chapter we'll learn all about them. In order to understand how this is possible, we'll first need to understand the principles of variance. Then, we'll look at three simple rules that explain when one parameterized type can be the subtype of another. ## Generics DevFeed: [Generics]() Original publisher: [Read original article]() Author: author@typealias.com (Dave Leeds) Published: 2024-03-26T00:00:00Z Content type: tutorial Language: en Sources: [Dave Leeds on Kotlin - typealias.com]() Topics: [generics](), [Kotlin]() Tags: [classes](), [collections](), [enum-class](), [function](), [generics](), [introduction](), [kotlin](), [kotlin-generic-function](), [kotlin-generics](), [kotlin-parameterized-types](), [kotlin-type-argument](), [kotlin-type-erasure](), [kotlin-type-parameter](), [kotlin-type-parameter-constraint](), [kotlin-type-safety](), [learn-to-program](), [list](), [map](), [pair](), [programming]() ### AI overview A tutorial introducing Kotlin generics through collection types such as List, Pair, and Map, using a beverage-menu example with classes and an enum class. ### Source excerpt All the way back in Chapter 8, when we introduced collections, we saw our first generic type: List ... then we saw more generics in Chapter 9 when we looked at the Pair and Map classes. In order to stay focused on learning about collection types, we glossed over the details about these classes. Well, we've put off learning about them for long enough! It's finally time for us to gain a full understanding of generics, so buckle up! ## Handling Runtime Exceptions DevFeed: [Handling Runtime Exceptions]() Original publisher: [Read original article]() Author: author@typealias.com (Dave Leeds) Published: 2024-02-28T00:00:00Z Content type: tutorial Language: en Sources: [Dave Leeds on Kotlin - typealias.com]() Topics: [Exception](), [Kotlin](), [Code]() Tags: [custom-exceptions](), [exception](), [exception-handling](), [exception-types-in-kotlin](), [exceptions](), [how-to](), [introduction](), [kotlin](), [kotlin-programming](), [kotlin-throw-keyword](), [learn-to-program](), [programming](), [runtime-errors](), [try-catch-blocks]() ### AI overview This Kotlin tutorial explains runtime exceptions, contrasting runtime problems with compile-time errors and introducing how to handle unexpected problems while a program runs. ### Source excerpt In real life, when we decide to do something, we primarily think in terms of a successful experience. For example, if you're driving to your friend's house for dinner, you might look up the directions on a mapping app, make sure you've got enough gasoline in the car, and leave at the right time in order to arrive when dinner is hot. If everything goes according to plan, you'll arrive on time. ## Sealed Types DevFeed: [Sealed Types]() Original publisher: [Read original article]() Author: author@typealias.com (Dave Leeds) Published: 2024-01-16T00:00:00Z Content type: tutorial Language: en Sources: [Dave Leeds on Kotlin - typealias.com]() Topics: [Kotlin](), [interfaces]() Tags: [classes](), [enum](), [exhaustive](), [exhaustive-matching](), [interfaces](), [introduction](), [kotlin](), [learn-to-program](), [programming](), [sealed](), [sealed-class](), [sealed-interface](), [subtype](), [types](), [when-conditional](), [when-expression]() ### AI overview A tutorial chapter explains how Kotlin sealed interfaces and classes restrict the set of possible types, helping ensure that all possibilities are handled in a when expression. ### Source excerpt In Chapter 5, we saw how limiting our options can be a good thing. In that chapter, we used enum classes to limit our values, which allows Kotlin to ensure that we account for all possibilities in a when expression. We can get a similar benefit for our types by using sealed interfaces and classes. In this chapter, we'll visit Cecil's Ice Shop to learn all about sealed types. Let's get started! ## Data Classes and Destructuring DevFeed: [Data Classes and Destructuring]() Original publisher: [Read original article]() Author: author@typealias.com (Dave Leeds) Published: 2023-10-09T00:00:00Z Content type: tutorial Language: en Sources: [Dave Leeds on Kotlin - typealias.com]() Topics: [Kotlin](), [data]() Tags: [class](), [classes](), [copy](), [data-class](), [destructuring](), [destructuring-assignment](), [equals](), [hashcode](), [introduction](), [kotlin](), [learn-to-program](), [object](), [open](), [operator](), [override](), [programming](), [properties](), [tostring]() ### AI overview A Kotlin tutorial introducing data classes and destructuring. It explains how data classes relate to equals(), hashCode(), and toString(), beginning with reference equality and overriding inherited functions. ### Source excerpt At the end of the last chapter, we saw how all objects in Kotlin inherit three functions from an open class called Any. Those functions are equals(), hashCode(), and toString(). In this chapter, we're going to learn about data classes, which are super-powered classes that are especially helpful when we've got an immutable class that mainly just holds properties. To better understand data classes, let's first explore each of the three functions above, and see what's involved when we override them! ## Abstract and Open Classes DevFeed: [Abstract and Open Classes]() Original publisher: [Read original article]() Author: author@typealias.com (Dave Leeds) Published: 2023-08-21T00:00:00Z Content type: tutorial Language: en Sources: [Dave Leeds on Kotlin - typealias.com]() Topics: [Code](), [interfaces]() Tags: [abstract-class](), [classes](), [compare](), [delegation](), [extend](), [function](), [implement](), [inheritance](), [interface](), [interfaces](), [introduction](), [kotlin](), [learn-to-program](), [open-class](), [polymorphism](), [programming](), [retro](), [speed](), [subclass](), [superclass]() ### AI overview A tutorial chapter explaining how to extend open and abstract classes to create subtypes and share general code. It compares this approach with interfaces and delegation, highlighting that each has advantages and disadvantages. ### Source excerpt In Chapter 12, we saw how we could use interfaces to create subtypes, and in the last chapter, we saw how we could use delegation with interfaces in order to share general code among specific classes. In this chapter, we'll learn how we can extend open and abstract classes to accomplish these same things with a different approach. Each approach has its advantages and disadvantages, so we'll also look at how they compare to one another. ## Introduction to Class Delegation DevFeed: [Introduction to Class Delegation]() Original publisher: [Read original article]() Author: author@typealias.com (Dave Leeds) Published: 2023-02-06T00:00:00Z Content type: tutorial Language: en Sources: [Dave Leeds on Kotlin - typealias.com]() Topics: [Kotlin](), [Code](), [interfaces]() Tags: [code](), [delegation](), [introduction](), [kotlin](), [learn-to-program](), [override](), [programming]() ### AI overview A tutorial introducing Kotlin class delegation. It explains how interfaces and delegation let classes reuse functions and properties, using a restaurant waiter-and-chef analogy before modeling the relationship in Kotlin. ### Source excerpt Back in Chapter 2, we introduced functions as a way to prevent us from duplicating expressions. Once we start working with classes, we might notice that it's also possible to end up duplicating our functions. There are lots of ways to reuse our functions instead of duplicating them. In this chapter, we'll see how we can use interfaces with Kotlin's class delegation feature to reuse the code from our functions and properties. ## Introduction to Interfaces DevFeed: [Introduction to Interfaces]() Original publisher: [Read original article]() Author: author@typealias.com (Dave Leeds) Published: 2022-09-12T00:00:00Z Content type: tutorial Language: en Sources: [Dave Leeds on Kotlin - typealias.com]() Topics: [interfaces](), [Kotlin](), [Code]() Tags: [abstraction](), [cast](), [code](), [implementation](), [interface](), [interfaces](), [introduction](), [kotlin](), [language](), [learn-to-program](), [programming](), [safe-cast](), [smart-cast](), [unsafe-cast]() ### AI overview This Kotlin tutorial introduces interfaces as a language feature that lets a single object have more than one type. It builds on Kotlin's built-in and custom types and begins illustrating the concept with a chicken and farmer example. ### Source excerpt Ever since Chapter 1, we've used a variety of built-in Kotlin types, like Int, String, and Boolean. Then in Chapter 4, we introduced our own custom types, like Circle, by writing classes. In this chapter, we'll dive into interfaces, which allow you to declare that a single object has more than one type at a time! Interfaces are a powerful language feature, and when used well, they can take your code to the next level. ## Scopes and Scope Functions DevFeed: [Scopes and Scope Functions]() Original publisher: [Read original article]() Author: author@typealias.com (Dave Leeds) Published: 2022-08-22T00:00:00Z Content type: tutorial Language: en Sources: [Dave Leeds on Kotlin - typealias.com]() Topics: [Kotlin](), [Library](), [Code]() Tags: [also](), [apply](), [classes](), [code](), [introduction](), [kotlin](), [learn](), [learn-to-program](), [let](), [library](), [programming](), [run](), [scope](), [scope-function](), [scope-functions](), [shadowing](), [standard](), [standard-library](), [variable](), [visibility](), [with]() ### AI overview A Kotlin tutorial chapter introduces scopes as regions of code where variables, functions, and classes can be declared, then begins explaining Kotlin's five scope functions from the standard library. ### Source excerpt In the last chapter, we learned how to create extension functions, which can be called using dot notation. In this chapter, we'll learn about scope functions, which are five particular functions that Kotlin gives us in its standard library. Before we can understand scope functions, though, it helps to first understand scopes. Introduction to Scopes In Kotlin, a scope is a section of code where we can declare new variables, functions, classes, and more. ## Receivers and Extensions DevFeed: [Receivers and Extensions]() Original publisher: [Read original article]() Author: author@typealias.com (Dave Leeds) Published: 2022-06-13T00:00:00Z Content type: tutorial Language: en Sources: [Dave Leeds on Kotlin - typealias.com]() Topics: [Extension](), [Kotlin]() Tags: [explicit-receiver](), [extension](), [extension-function](), [extension-property](), [extensions](), [how-to](), [implicit-receiver](), [introduction](), [kotlin](), [learn-to-program](), [programming](), [receiver]() ### AI overview A Kotlin tutorial chapter explaining how extensions add functions and properties to existing classes. It introduces explicit and implicit receivers, extension functions, and extension properties. ### Source excerpt Kotlin extensions can be used to add new functions and properties to existing classes--even to classes that you didn't write! In this chapter, we'll cover explicit receivers, implicit receivers, extension functions, and extension properties. Buckle up! Standalone Functions and Object Functions Way back in Chapter 2, we learned how to create functions. Here's a very simple function that puts single quotes at the beginning and the end of a String. ## Collections: Maps DevFeed: [Collections: Maps]() Original publisher: [Read original article]() Author: author@typealias.com (Dave Leeds) Published: 2022-05-04T00:00:00Z Content type: tutorial Language: en Sources: [Dave Leeds on Kotlin - typealias.com]() Topics: [Kotlin](), [data]() Tags: [associate](), [association](), [build](), [collections](), [groupby](), [how-to](), [introduction](), [kotlin](), [learn-to-program](), [map](), [maps](), [pair](), [programming]() ### AI overview A tutorial chapter introduces maps as a Kotlin collection for storing associations between values. It explains the concept using a hardware-and-tools example and begins showing how to create associations with a class constructor. ### Source excerpt In the last chapter, we saw how collections, such as lists and sets, can be used to do things that couldn't be done easily with separate, individual variables. In this chapter, we're going to look at another kind of collection--a map, which can hold many associations between values. Let's check it out! The Right Tool for the Job "You gotta use the right tool for the job." That's what Mr. Patchwell taught his young son, Jack, who was just starting to learn how to become a handyman like his old man. ## Collections: Lists and Sets DevFeed: [Collections: Lists and Sets]() Original publisher: [Read original article]() Author: author@typealias.com (Dave Leeds) Published: 2022-04-18T00:00:00Z Content type: tutorial Language: en Sources: [Dave Leeds on Kotlin - typealias.com]() Topics: [Kotlin](), [Code](), [Learning]() Tags: [code](), [collection-operations](), [collections](), [filter](), [foreach](), [introduction](), [kotlin](), [learn-to-program](), [learning](), [list](), [map](), [programming](), [set]() ### AI overview A Kotlin tutorial introduces collections by explaining how to group values and begins demonstrating lists and sets through a book-list example. ### Source excerpt So far, we've only worked with variables as individual values. Writing Kotlin becomes so much more interesting once we start putting values together in such a way that we can work with them as a collection. To learn about collections, let's visit Libby, a bright young lady who's always got a book nearby! Let's put things together! Libby is a voracious reader. She's always on the lookout for a great novel, so whenever someone tells her about a good book, she jots down the title on a list that she keeps on a sheet of paper. ## Lambdas and Function References DevFeed: [Lambdas and Function References]() Original publisher: [Read original article]() Author: author@typealias.com (Dave Leeds) Published: 2022-02-28T00:00:00Z Content type: tutorial Language: en Sources: [Dave Leeds on Kotlin - typealias.com]() Topics: [Kotlin](), [Code]() Tags: [closure](), [code](), [function](), [function-reference](), [introduction](), [kotlin](), [lambda](), [learn-to-program](), [programming](), [types]() ### AI overview A tutorial introduction to Kotlin lambdas, function types, and function references, using a barber-shop pricing example involving coupons and tax. ### Source excerpt As we've seen, functions are a basic building block of Kotlin code. Throughout this book, we've written a lot of them, all using the fun keyword. Kotlin also gives us another way to write functions--lambdas! To help us learn about function types, function references, and lambdas, we'll need to pay a visit to Bert's Snips & Clips. Bert's Snips & Clips Bert's Snips & Clips is the barber shop to go to for a clean haircut and a nice smooth shave. ## Nulls and Null Safety DevFeed: [Nulls and Null Safety]() Original publisher: [Read original article]() Author: author@typealias.com (Dave Leeds) Published: 2021-03-30T00:00:00Z Content type: tutorial Language: en Sources: [Dave Leeds on Kotlin - typealias.com]() Topics: [Kotlin](), [Jetpack Compose]() Tags: [elvis-operator](), [introduction](), [kotlin](), [learn-to-program](), [not-null-assertion-operator](), [null](), [null-safety](), [optional](), [programming](), [safe-call-operator](), [smart-cast]() ### AI overview An introduction to nulls and null safety in Kotlin, explaining that variables may not always hold a value and setting up a coffee-rating example implemented in Kotlin. ### Source excerpt So far in this book, every time that we created a variable, whether it was a String, an Int, or a Boolean, we assigned a value to it. There are times, though, when we need to create a variable that might not actually hold a value! This brings us to the exciting topic of nulls! Introduction to Nulls James has set up a coffee stand downtown, and he's ready to start sharing his fine brew! ## Enum Classes in Kotlin DevFeed: [Enum Classes in Kotlin]() Original publisher: [Read original article]() Author: author@typealias.com (Dave Leeds) Published: 2020-10-19T00:00:00Z Content type: tutorial Language: en Sources: [Dave Leeds on Kotlin - typealias.com]() Topics: [Kotlin]() Tags: [class](), [classes](), [enum](), [enum-class](), [enumeration](), [introduction](), [kotlin](), [learn-to-program](), [programming]() ### AI overview A Kotlin tutorial chapter introduces enum classes as a special kind of class for representing a limited number of values. ### Source excerpt In the last chapter, we created our very own type, called Circle, using a feature in Kotlin called a class. In this chapter, we're going to look at a special kind of class--an enum class--which is particularly useful when we want to represent a limited number of values. I hope you like Schnauzers, because this chapter is full of them! Limiting the Values Schnauzers are amazing dogs--they're smart, they're loyal to their owners, and they seem to have an opinion about everything! ## Examples of Classes in Kotlin DevFeed: [Examples of Classes in Kotlin]() Original publisher: [Read original article]() Author: author@typealias.com (Dave Leeds) Published: 2020-08-31T00:00:00Z Content type: tutorial Language: en Sources: [Dave Leeds on Kotlin - typealias.com]() Topics: [Kotlin](), [Code]() Tags: [classes](), [code](), [concepts](), [constructor](), [examples](), [function](), [generic](), [how-to](), [kotlin](), [programming](), [property](), [reference](), [visibility-modifier]() ### AI overview A quick reference to creating classes in Kotlin, including a simple class with no properties or functions. It explains that classes combine variables and functions into a single unit. ### Source excerpt One core concept in Kotlin is a class, which allows you to combine variables and functions into a single unit. This article is a quick reference that shows how to create classes in Kotlin. There's also a full article called Introduction to Classes and Objects, which is a gentle introduction to these concepts, so if you're new to the language, you might want to start there! A Simple Class For a class that has no properties or functions, you can create a class in Kotlin with very little code: ## Introduction to Classes and Objects DevFeed: [Introduction to Classes and Objects]() Original publisher: [Read original article]() Author: author@typealias.com (Dave Leeds) Published: 2020-06-29T00:00:00Z Content type: tutorial Language: en Sources: [Dave Leeds on Kotlin - typealias.com]() Topics: [Kotlin]() Tags: [class](), [classes](), [constructor](), [function](), [introduction](), [kotlin](), [learn-to-program](), [object](), [programming](), [property](), [types](), [visibility-modifier]() ### AI overview A Kotlin tutorial chapter introduces classes as a way to combine related variables and functions into new types. It uses a circle example and begins by defining an empty class before adding members step by step. ### Source excerpt In Chapter 1, we learned about a variety of types in Kotlin, such as Double, String, and Boolean. Get ready, because in this chapter, we're going to start creating our very own types! We'll put variables and functions together into a class. Let's get started! Putting Variables and Functions Together As you might recall, we started off this book by creating variables to hold things pertaining to a circle, such as its radius and circumference. ## Kotlin Conditionals: When and If DevFeed: [Kotlin Conditionals: When and If]() Original publisher: [Read original article]() Author: author@typealias.com (Dave Leeds) Published: 2020-05-05T00:00:00Z Content type: tutorial Language: en Sources: [Dave Leeds on Kotlin - typealias.com]() Topics: [Kotlin](), [Programming](), [Code]() Tags: [code](), [conditionals](), [if-expression](), [if-statement](), [introduction](), [kotlin](), [learn-to-program](), [programming](), [when-expression](), [writing-code]() ### AI overview A beginner-oriented chapter explaining Kotlin conditionals through branches, execution paths, and a Goldilocks porridge temperature example. ### Source excerpt In real life, we do different things depending on the circumstances. For example, if it's raining outside, you'll probably grab an umbrella. If it's sunny outside, you might grab your sunglasses. We do different things depending on the weather. Similarly, we often need our code to do different things in different situations, so in this chapter, we'll look at Kotlin's conditionals. Goldilocks and the Three Branches You might have heard the fairy tale of Goldilocks and the Three Bears. ## Functions DevFeed: [Functions]() Original publisher: [Read original article]() Author: author@typealias.com (Dave Leeds) Published: 2020-04-07T00:00:00Z Content type: tutorial Language: en Sources: [Dave Leeds on Kotlin - typealias.com]() Topics: [Kotlin](), [Code]() Tags: [argument](), [code](), [function](), [introduction](), [kotlin](), [learn-to-program](), [parameter](), [programming]() ### AI overview A Kotlin tutorial chapter introduces functions as a way to calculate the circumference of circles of different sizes without repeating the same code. ### Source excerpt In the last chapter, we wrote some Kotlin code to calculate the circumference of individual circles. Once we start calculating the circumference of many circles of different sizes, we can easily end up writing the same code over and over again. In this chapter, we're going to write functions, which will make it easy to calculate the circumference of any circle--without repeating ourselves! Introduction to Functions In the last chapter, we saw that it's easy to calculate the circumference of a circle. ## Variables, Expressions, and Types DevFeed: [Variables, Expressions, and Types]() Original publisher: [Read original article]() Author: author@typealias.com (Dave Leeds) Published: 2020-03-05T00:00:00Z Content type: tutorial Language: en Sources: [Dave Leeds on Kotlin - typealias.com]() Topics: [Kotlin](), [Programming](), [Code]() Tags: [developer](), [expression](), [fundamentals](), [introduction](), [kotlin](), [language](), [learn-to-program](), [programming](), [statement](), [types](), [val](), [var](), [variable]() ### AI overview An introductory Kotlin chapter explains variables, expressions, and types. It uses the example of a circle's radius to show how variables represent values and introduces variables as containers for numbers and other data in programming. ### Source excerpt So you want to be a Kotlin developer? You've come to the right place! This book will take you through the fundamentals of Kotlin, gently introducing you to the most important concepts of the language in order to help you become a proficient Kotlin developer. Even if you're a seasoned professional, it's important to know the fundamentals in order to establish a solid foundation of understanding so that you can be as effective as possible. ## When to Use Sequences DevFeed: [When to Use Sequences]() Original publisher: [Read original article]() Author: author@typealias.com (Dave Leeds) Published: 2019-09-16T00:00:00Z Content type: tutorial Language: en Sources: [Dave Leeds on Kotlin - typealias.com]() Topics: [Kotlin](), [Streams](), [Java]() Tags: [article](), [benchmark](), [benchmarks](), [collections](), [guide](), [kotlin](), [performance](), [programming](), [sequences](), [series](), [stateful](), [stateless](), [streams]() ### AI overview A tutorial comparing Kotlin sequences with normal collections and Java streams. It explains performance trade-offs, including how operation-chain length and intermediate collections can affect efficiency, while emphasizing that benchmarks with realistic data are needed for specific code. ### Source excerpt One of the most common questions I get about Kotlin's sequences is this: "When should I use sequences, and when should I use normal collections?" That's the question we're going to answer in this third and final article in this series! We're going to look at the trade-offs of each, including the main things that affect their performance. Then, we'll look at how Kotlin's sequences stack up against Java streams, a similar concept. ## Inside Sequences: Create Your Own Sequence Operations DevFeed: [Inside Sequences: Create Your Own Sequence Operations]() Original publisher: [Read original article]() Author: author@typealias.com (Dave Leeds) Published: 2019-07-23T05:00:00Z Content type: tutorial Language: en Sources: [Dave Leeds on Kotlin - typealias.com]() Topics: [Kotlin](), [data]() Tags: [article](), [collection-operations](), [collections](), [data](), [guide](), [intermediate](), [iterable](), [kotlin](), [programming](), [sequences](), [terminal]() ### AI overview A tutorial that examines how Kotlin sequences process collection elements and explains their relationship to iterables and iterators. It also demonstrates how to create a custom sequence class and use it in an operation chain. ### Source excerpt Sequences are a fantastic way to process collections of data in a way that can perform better than the standard collection operations, as we saw in the previous article, Kotlin Sequences: An Illustrated Guide. Today, we're going even deeper! We're going to look under the hood - inside Kotlin sequences - in order to understand how they work like never before! In fact, by the end of this article, we'll even create our very own Sequence class and plug it into an operation chain! [Next page]()