Arrow Media

Arrow put on a big show at Kotlin Dev Day

June 14, 2022

A recap of the attention Arrow received at Kotlin Dev Day.

Arrow Core Arrow Fx

Building applications with Kotlin and Arrow.kt in style

May 31, 2022

A presentation by Simon Vergauwen presented on the official Kotlin YouTube channel.

Arrow Core Arrow Fx

Functional Android

Kotlin London
January 13, 2021

In this talk from the January 13th, 2021 Kotlin London User Group meetup, Jorge Castillo shows how to seamlessly integrate the functional programming paradigm with our Android architecture to get the most out of both worlds.

Arrow Fx

Roll your own Computation blocks in Kotlin

Lambda Lille
December 16, 2020

Computation blocks empower library authors and users to build ad-hoc operators and DSLs over any data-type getting rid of API complexity and simplifying composition. In this talk, we will learn how we can build Computation blocks over Kotlin suspend functions & the Arrow Continuations library’s reset / shift capabilities. We will demonstrate the composition of well known JVM data-types and patterns such as lists, futures, streams, and IOs, where callback chains can be simply replaced by a single suspended operator. The Kotlin suspension system provides enough capabilities to implement delimited continuations allowing us to ignore methods such as map & flatMap on your favorite data-type in favor of direct imperative syntax. Leveraging Kotlin suspension & thinking of Continuations as “The Mother of all Monads”, we will embark on this journey where we’ll build and roll our own computation blocks with Arrow Continuations.

Arrow Core Arrow Fx

Arrow Fx: Functional Domain Modeling with Kotlin

Kotliners 2020
June 05, 2020

Arrow Fx is a purely functional concurrency framework for Kotlin’s suspend system.

In this talk, we will learn how typed functional programming and functional domain modeling powered by Arrow Optics, Fx, and Meta can be applied to assemble powerful applications and architectures from small and simple building blocks.

Simon and Raul will cover important topics and patterns such as optics, union types, refined types, type classes, automatic task cancellation, safe resource handling, and compare how Arrow Fx differs from KotlinX coroutines.

Arrow Fx

Android architectures with Arrow Fx

May 06, 2020

May 2020 Online Kotlin Meetup

Daniel Montoya Ramos - Senior Software Engineer @47deg Android Jetpack Compose

Dani will show a new way of building UI’s in Android using Jetpack Compose, comparing Imperative vs Declarative approaches. He’ll look at managing state changes, composing functions as well as some of the gotchas and wishes for the future.

Alberto Ballano - Senior Software Engineer @47deg Android architectures with Arrow Fx

Alberto will talk about typical Android architectures, and how can they benefit from Functional Programming techniques available in Arrow.

Arrow Fx

IO integration with kotlinx.coroutines

March 02, 2020

This article showcases the brand new Arrow integration module for KotlinX Coroutines included in the Arrow 0.10.5 release.

Arrow Fx

FP with Kotlin/Arrow: Monad Comprehensions & Parallel Processing

February 26, 2020

Arrow has multiple libraries available for functional programming. In this talk we’ll focus on Arrow FX and learn how to handle IO in a functional way with an introduction to monadic composition. Then we’ll examine how to compose monads in a cleaner fashion with Arrow FX’s monad comprehensions. Finally, we’ll take a look at how to parallelize IO monads with parallel map strategies.

Arrow Fx

Kotlin Functional Programming: Parallel Processing The Functional Way with Arrow Fx

January 29, 2020

Learn how to handle parallel processing in Kotlin with Arrow IO monads.

Arrow Fx

Kotlin Functional Programming: Monads & Composition with Arrow Fx

January 29, 2020

Arrow is a library created by folks over at a company called 47 degrees . In a nutshell, Arrow brings a slew of functional programming features to Kotlin. It is heavily inspired by Scala and Haskell, and emphasizes a lot of the concepts that those languages started

Arrow Fx

Kotlin Functional Programming: Cleaner Composition with Monad Comprehensions in Arrow Fx

January 29, 2020

Learn how to write cleaner monadic composition in Kotlin with Arrow’s monad comprehensions, available in Arrow FX.

Arrow Fx

Arrow Comonad Approach for GameOfLife with Android Compose

January 14, 2020

The purpose of this article is complement the bow + SwifUi solution for the game of live we can find here https://www.47deg.com/blog/conway-swift/ with the arrow + compose version.

Arrow Fx

Kotlin coroutines with arrow-fx

December 15, 2019

The purpose of this article is to summarize the approaches from questions at Slack about the usage of Either, Option and other datatypes and to give a tour of arrow-fx usage and APIs.

Arrow Fx

Conway's Game of Life using Kotlin and Arrow

December 12, 2019

An article of a series on Functional Programming solutions for the Global Day of Coderetreat challenge. In this case, it shows an approach for it using Kotlin and Functional Programming provided by the Arrow library.

Arrow Core Arrow Fx

Arrow Fx & Arrow Meta - Functional Programming for the masses

Functional JVM Meetup, Prague
November 27, 2019

In this meetup we discuss the new features of Arrow Fx to write “effectful” programs with an emphasis on simple and declarative programming for everyone. Additionally, we see how Arrow Meta works and how we can use it to improve the ergonomics of Functional Programming in Kotlin.

Arrow Meta Arrow Fx

Effect polymorphism with Arrow FX

July 22, 2019

Wonder how to handle side effects in a very clean way while abstracting the real effect implementation? #Arrow #FX provides an easy way to do this, without the burden of Higher-Kinded Types.

Arrow Fx

Self-contained example of testing with modules and Arrow FX

July 05, 2019

This post shows a porting with Kotlin and Arrow FX of a self-contained testing example with Scala ZIO

Arrow Core Arrow Fx

ArrowFx: Functional Programming for the masses

Kotliners, Budapest
June 07, 2019

In this talk we recap about the imminent future of Functional Programming in Kotlin. With ArrowFx you are able to encode “effectful” programs in a controlled way following the FP principles through a direct syntax. You’ll think you’re writing imperative code!

Arrow Fx

Immutable Conversations - Past and Future of Arrow

March 12, 2019

In this episode, we capture a conversation between Arrow maintainers Raúl Raja and Paco Estevez as they discuss the past and future of the library which is designed to bring Functional Programming to Kotlin.

Arrow Core Arrow Fx

From Imperative to Functional Programming using Arrow

February 10, 2019

As its name implies, From Imperative to Functional Programming using Arrow is a tale about migrating a simple Kotlin application written in imperative style to a fully function application with the help of the Arrow library.

Arrow Core Arrow Fx

Webflux with Kotlin and Arrow

February 03, 2019

Webflux with Kotlin and Arrow shows how you can use Arrow together with Spring Webflux to create a reactive REST application. This article explains how to use the MonoK and the FluxK Arrow extensions together with the binding function to make working with the Mono and Flux reactor constructs much easier and better understandable.

Arrow Core Arrow Fx

Getting started with FP in Kotlin and Arrow: Typeclasses

January 03, 2019

Getting started with FP in Kotlin and Arrow: Typeclasses explores part of the Arrow library by explaining how you can use Arrow to create your own typeclasses and use the ones provided by Arrow to make your code more concise and better readable.

Arrow Core Arrow Fx

Functional Hangman Game written with Arrow

November 30, 2018

Functional Hangman game - console application written with Arrow. Uses the IO<A> monad to push side effects to the edge of the system.

Arrow Core Arrow Fx

Architecting Typed FP Applications & Libraries in Kotlin with Λrrow

KotlinConf, Amsterdam
October 05, 2018

This talk includes a comprehensive walkthrough of the most important patterns covered by the data types and type classes we find in Λrrow. Each pattern will be accompanied by code examples that illustrate how Λrrow brings Typed Functional Programming to Kotlin.

Sources and slides

Arrow Core Arrow Fx