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Finding an Element in a List Using Kotlin 1. Overview In this tutorial, we’re going to see how to find an element in a list using Kotlin language. Also, we’re going to filter this list by a condition. 2. Find an Element in a List Let’s say that we have… Continue Reading kotlin-finding-element-in-list
Void Type in Kotlin 1. Introduction In this tutorial, we’ll learn about Void type in Kotlin and essentially other ways to represent void or nothing in Kotlin. 2. Void vs void – in Java To understand the use of Void in Kotlin, let’s first review what is a Void type in… Continue Reading kotlin-void-type
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Kotlin Annotations 1. Overview In this tutorial, we’ll give an overview of Kotlin annotations. We’ll demonstrate how to apply them, how to create and customize our own ones. We’ll then briefly discuss the interplay between annotations and keywords in Java and Kotlin. Finally, we’ll give a simple example of a… Continue Reading kotlin-annotations
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Introduction to Arrow in Kotlin 1. Overview Arrow is a library merged from KΛTEGORY and funKTionale. In this tutorial, we’ll look at the basics of Arrow and how it can help us harness the power of functional programming in Kotlin. We’ll discuss the data types in the core package and investigate a use-case about… Continue Reading kotlin-arrow
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Kotlin Contracts 1. Overview In this tutorial, we will talk about Kotlin Contracts. Their syntax is not stable yet, but the binary implementation is, and Kotlin stdlib itself is already putting them to use. Basically, Kotlin contracts are a way to inform the compiler about the behavior of a function. 2. Maven… Continue Reading kotlin-contracts
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MockMvc Kotlin DSL 1. Overview In this quick tutorial, we’ll have a look at the new Kotlin-specific MockMvc support available in Spring Framework 5.2+. Note: as version 5.2 is not GA yet, we need to use the Spring Milestone repository. 2. The Controller to Test Let’s set up the controller… Continue Reading mockmvc-kotlin-dsl
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InputStream to String in Kotlin 1. Overview In this brief tutorial, we’ll find out how to read an InputStream into a String. Kotlin provides an easy way to perform the conversion. However, there are still some nuances to consider when working with resources. Plus, we’ll cover special cases, like reading up… Continue Reading kotlin-inputstream-to-string
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MockK: A Mocking Library for Kotlin 1. Overview In this tutorial, we’re going to take a look at some of the basic features of the MockK library. 2. MockK In Kotlin, all classes and methods are final. While this helps us write immutable code, it also causes some problems during testing.… Continue Reading kotlin-mockk
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Advanced Quasar Usage for Kotlin 1. Introduction We recently looked at Quasar, which gives us tools to make asynchronous programming more accessible and more efficient. We’ve seen the basics of what we can do with it, allowing for lightweight threads and message passing. In this tutorial, we’re going to see… Continue Reading kotlin-quasar-advanced
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How to use Kotlin Range Expressions 1. Introduction A range is a sequence of values defined by a start, an end, and a step. In this quick tutorial, we’ll have a look at how we can define and use ranges in Kotlin. 2. Using Kotlin Ranges In Kotlin, we can create… Continue Reading kotlin-ranges
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