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  • Book Overview & Buying Functional Kotlin
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Functional Kotlin

Functional Kotlin

By : Mario Arias, Rivu Chakraborty
3 (1)
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Functional Kotlin

Functional Kotlin

3 (1)
By: Mario Arias, Rivu Chakraborty

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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Applicatives


Our previous example, invoking a lambda inside a wrapper with a parameter inside the same kind of wrapper, is the perfect way to introduce applicatives.

An applicative is a type that defines two functions, a pure(t: T) function that returns the T value wrapped in the applicative type, and an ap function (apply, in other languages) that receives a lambda wrapped in the applicative type.

In the previous section, when we explained monads, we made them extend directly from a functor but in reality, a monad extends from an applicative and an applicative extends from a functor. Therefore, our pseudo code for a generic applicative, and the entire hierarchy, will look like this:

interface Functor<C<_>> { //Invalid Kotlin code
    fun <A,B> map(ca:C<A>, transform:(A) -> B): C<B>
}

interface Applicative<C<_>>: Functor<C> { //Invalid Kotlin code
    fun <A> pure(a:A): C<A>

    fun <A, B> ap(ca:C<A>, fab: C<(A...
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Functional Kotlin
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