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Manipulating Collections

Handling lists of items is a common occurrence in life as well as in programming languages. When a list has associated functions that help us manipulate the items in the list, we often call that object a collection.

In this chapter, we will see how high-order functions can be used to greatly simplify the task of manipulating collections. We'll see how we can code using functional programming techniques and open source functional packages to create elegant solutions that are not only insightful, but also performant in today's distributed processing environments.

Our goal in this chapter is to:

Iterate through a collection
Learn about intermediate and terminal functors
Use predicates to filter items in a collection
Test using a Mocha-like BDD library
Focus on Map functions
Grasp the breadth of the collection-manipulating functions in...

Key benefits

Write concise and maintainable code with streams and high-order functions

Understand the benefits of currying your Golang functions

Learn the most effective design patterns for functional programming and learn when to apply each of them

Build distributed MapReduce solutions using Go

Description

Lex Sheehan begins slowly, using easy-to-understand illustrations and working Go code to teach core functional programming (FP) principles such as referential transparency, laziness, recursion, currying, and chaining continuations. This book is a tutorial for programmers looking to learn FP and apply it to write better code. Lex guides readers from basic techniques to advanced topics in a logical, concise, and clear progression. The book is divided into four modules. The first module explains the functional style of programming: pure functional programming, manipulating collections, and using higher-order functions. In the second module, you will learn design patterns that you can use to build FP-style applications. In the next module, you will learn FP techniques that you can use to improve your API signatures, increase performance, and build better cloud-native applications. The last module covers Category Theory, Functors, Monoids, Monads, Type classes and Generics. By the end of the book, you will be adept at building applications the FP way.

What you will learn

Learn how to compose reliable applications using high-order functions

Explore techniques to eliminate side-effects using FP techniques such as currying

Use first-class functions to implement pure functions

Understand how to implement a lambda expression in Go

Compose a working application using the decorator pattern

Create faster programs using lazy evaluation

Use Go concurrency constructs to compose a functionality pipeline

Understand category theory and what it has to do with FP

What do you get with eBook?

Instant access to your Digital eBook purchase

Download this book in EPUB and PDF formats

Access this title in our online reader with advanced features

DRM FREE - Read whenever, wherever and however you want

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Go: Design Patterns for Real-World Projects

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l3x Nov 30, 2017

An author providing the first comment?Yes. It's "unconventional" but so is this book.This book tackles the unconventional topic of using functional programming (FP) with Go.I won't steal the thunder of reviewers with details, but I would like to share one thing...---A reviewer just asked me: "Curious, what was your path for learning about functional programming?"My response: A lot of google searches. Reading a lot of mathematics thesis papers. Watching a lot of videos. There was no one good source to learn about category theory especially for programmers. I learned more about category theory from studying Philip Wadler. (He actually is actually quite approachable).---Thank you, Dr. Wadler and all the mathematicians in the chain of discoveries that have shared their wisdom. Thank you, everyone that has written about FP and software design. If what you said is valuable, then you'll likely find it in some form in this book.I hope that my research efforts, discoveries, implementations, and writing style will benefit all readers.FP is pure. Go is simple.Read my book. Take this journey with me and judge for yourself how powerful FP + Go can be.Cheers!Lex

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Akram Ahmad Aug 22, 2018

- I am simply stunned by the high quality of "Learning Functional Programming in Go" by Lex Sheehan. Take this from someone who—and readers of my popular blog "Programming Digressions" are aware of this—knows a thing or two about Functional Programming (FP). This amazing book could not have come to my attention at a better time: I've dived deep into using the Go programming language this year that is 2018...- If you think about it, in the end, everything is related, simple, and well-designed. The biggest problem, IMHO, especially with FP, is that the smart guys that originally saw how it works, seem to have the hardest time making it easy to understand. But that's not a problem (in the least, whatsoever) with "Learning Functional Programming in Go": This book somehow manages to capture tough ideas (think "essential complexity") and strips them of their complexity. And that's a big deal, if you ask me.- With a nod to the remarkable observation that "A language that doesn’t affect the way you think about programming, is not worth knowing" (by Alan Perlis, the very first recipient of the Turing Award), I am especially pleased to have this book by Lex Sheehan ("Learning Functional Programming in Go") at my side.- Among other things, working intensively with Go has forced me to rethink what it means to leverage a programming paradigm in the service of creating great software that's designed to unfold, to emerge—so to say—and to delight customers. Don't miss this book!

William Favorite Dec 16, 2019

I am not that far in, but I like the book. Let's get that out of the way.My issues are with the kindle delivery mechanism. So this means that any negativity about the product *delivery* falls on the shoulders of the author. The publisher is like the absentee landlord. So I bump the stars for the author, but good luck with buying it from Kindle.It seems to be formatted differently (scrolls and not page flip) which makes me think this is the reason I can't read it like other IT books I have bought in this manner.I like the "paper edition 'limitations'" better: - Physical possession is the single requirement for access. - No other special 'limitations'.

J. Kayser Sep 02, 2018

I don't have a background in functional program, so this is an important book for me.If you don't know Go, learn Go from "The Go Programming Language" by Alan A. A. Donovan and Brian W. Kernighan. This is the Golang equivalent of the K&R C book.Then, read this book ("Learning Functional Programming in Go" by Lex Sheehan), Especially valuable for programmers who don't know functional programming. I learned a ton just working through the first example (memoizing a fibonacci function). It helped cement my understanding of first class functions.Thank you Lex for taking the time and effort to write the book. Brilliant job.

Donam Kim Dec 21, 2017

I will postpone my review until I finish it.

Learning Functional Programming in Go: Change the way you approach your applications using functional programming in Go

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Learning Functional Programming in Go

Manipulating Collections

Iterating through a collection

Piping Bash commands

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