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Functional Kotlin

Functional Kotlin

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Functional Kotlin

Functional Kotlin

3 (1)

Overview of this book

Functional programming makes your application faster, improves performance, and increases your productivity. Kotlin supports many of the popular and advanced functional features of functional languages. This book will cover the A-Z of functional programming in Kotlin. This book bridges the language gap for Kotlin developers by showing you how to create and consume functional constructs in Kotlin. We also bridge the domain gap by showing how functional constructs can be applied in business scenarios. We’ll take you through lambdas, pattern matching, immutability, and help you develop a deep understanding of the concepts and practices of functional programming. If you want learn to address problems using Recursion, Koltin has support for it as well. You’ll also learn how to use the funKtionale library to perform currying and lazy programming and more. Finally, you’ll learn functional design patterns and techniques that will make you a better programmer.By the end of the book, you will be more confident in your functional programming skills and will be able to apply them while programming in Kotlin.
Table of Contents (16 chapters)
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Observables


As we discussed earlier, in reactive programming, Observable has an underlying computation that produces values that can be consumed by a consumer (Observer). The most important thing here is that the consumer (Observer) doesn't pull values here; rather, Observable pushes the values to the consumer. So, we can say that an Observable interface is a push-based, composable Iterator that emits its items through a series of operators to the final Observer, which finally consumes the items. Let's now break these things down sequentially to understand it better:

  • Observer subscribes to Observable
  • Observable starts emitting the items that it has in it
  • Observer reacts to whatever item the Observable emits

So, let's delve into how Observable works through its events/methods, namely onNext, onComplete, and onError.

How Observable works

As we stated earlier, an Observable value has the following three most important events/methods:

  • onNext: The Observable interface passes all the items one by one...
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