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Fuel HTTP Library with Kotlin 1. Overview In this tutorial, we’ll have a look at the Fuel HTTP Library, which is, in the author’s words, the easiest HTTP networking library for Kotlin/Android. Furthermore, the library can also be used in Java. The main features of the library include: Support for basic… Continue Reading kotlin-fuel
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Kotlin-allopen and Spring 1. Overview In Kotlin, all classes are final by default which, beyond its clear advantages, can be problematic in Spring applications. Simply put, some areas in Spring only work with non-final classes. The natural solution is to manually open Kotlin classes using the open keyword or to… Continue Reading kotlin-allopen-spring
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Introduction to RxKotlin 1. Overview In this tutorial, we’re going to review the use of Reactive Extensions (Rx) in idiomatic Kotlin using the RxKotlin library. RxKotlin is not an implementation of Reactive Extensions, per se. Instead, it’s mostly a collection of extension methods. That is, RxKotlin augments the RxJava library… Continue Reading rxkotlin
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Processing JSON with Kotlin and Klaxson 1. Overview Klaxon is one of the open source libraries that we can use to parse JSON in Kotlin. In this tutorial, we’re going to look at its features. 2. Maven Dependency First, we’ll need to add the library dependency to our Maven project: <dependency> <groupId>com.beust</groupId>… Continue Reading kotlin-json-klaxson
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Introduction to Quasar in Kotlin 1. Introduction Quasar is a Kotlin library that brings some asynchronous concepts to Kotlin in an easier to manage way. This includes lightweight threads, Channels, Actors, and more. 2. Setting Up the Build To use the most recent version of Quasar, you need to run… Continue Reading kotlin-quasar
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Idiomatic Logging in Kotlin 1. Introduction In this tutorial, we’ll take a look at a few logging idioms that fit typical Kotlin programming styles. 2. Logging Idioms Logging is a ubiquitous need in programming. While apparently a simple idea (just print stuff!), there are many ways to do it. In… Continue Reading kotlin-logging
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Building DSLs in Kotlin 1. Overview In this tutorial, we’ll see how powerful Kotlin language features can be used for building type-safe DSLs. For our example, we’ll create a simple tool for constructing SQL queries, just big enough to illustrate the concept. The general idea is to use statically-typed user-provided… Continue Reading kotlin-dsl
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Kotlin Scope Functions 1. Overview Scope functions are very useful, and we use them frequently in Kotlin code. In this tutorial, we’ll explain what they are and also provide some examples of when to use each one. 2. also First, let’s take a look at the mutation functions also and… Continue Reading kotlin-scope-functions
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Get a Random Number in Kotlin 1. Introduction This short tutorial will demonstrate how to generate a random number using Kotlin. 2. Random number using java.lang.Math The easiest way to generate a random number in Kotlin is to use java.lang.Math. Below example will generate a random double number between 0 and… Continue Reading kotlin-random-number
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HTTP Requests with Kotlin and khttp 1. Introduction The HTTP protocol and APIs built on it are of central importance in programming these days. On the JVM we have several available options, from lower-level to very high-level libraries, from established projects to new kids on the block. However, most of… Continue Reading kotlin-khttp
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