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Learning Functional Programming in Go
Learning Functional Programming in Go

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

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Full star icon Full star icon Full star icon Full star icon Half star icon 4.1 (8 Ratings)
Paperback Nov 2017 670 pages 1st Edition
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Profile Icon Sheehan
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Full star icon Full star icon Full star icon Full star icon Half star icon 4.1 (8 Ratings)
Paperback Nov 2017 670 pages 1st Edition
eBook
S$36.99 S$52.99
Paperback
S$66.99
Subscription
Free Trial
eBook
S$36.99 S$52.99
Paperback
S$66.99
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Learning Functional Programming in Go

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...

Iterating through a collection

In order to implement a collection, we must provide a way to access each element in the collection, which can be accomplished using the int index value shown in the following code. We will implement a first in, first out (FIFO) order queue. We will provide a way to store the elements using a slice data structure. Lastly, we will implement a Next() method to provide a way to traverse the elements in the collection.

In the following code, we define an interface for the Iterator object. It has one method, Next(), which will return the next element in the collection and a Boolean flag to indicate whether it's OK to continue iterating:

type CarIterator interface {
Next() (value string, ok bool)
}
const INVALID_INT_VAL = -1
const INVALID_STRING_VAL = ""

Next, we define a collection object that has two properties: an int index used to access...

Piping Bash commands

Executing a composition or chain of functions is very much like executing a series of Bash commands, where the output from one command is piped into the next command. For example, we might cat an input a file that contains a list of timestamps and IP addresses in an awk command. The awk command removes all but the seventh column. Next, we sort the list in descending order, and finally, we group that data by unique IP addresses.

Consider the following Bash command:

$ cat ips.log | awk '{print $7}' | sort | uniq -c

Let's give this command the following input:

Sun Feb 12 20:27:32 EST 2017 74.125.196.101
Sun Feb 12 20:27:33 EST 2017 98.139.183.24
Sun Feb 12 20:27:34 EST 2017 151.101.0.73
Sun Feb 12 20:27:35 EST 2017 98.139.183.24
Sun Feb 12 20:27:36 EST 2017 151.101.0.73
>Sun Feb 12 20:27:37 EST 2017 74.125.196.101
Sun Feb 12 20:27:38 EST...
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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.

Who is this book for?

This book is for Golang developers comfortable with OOP and interested in learning how to apply the functional paradigm to create robust and testable apps. Prior programming experience with Go would be helpful, but not mandatory.

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

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Nov 24, 2017
Length: 670 pages
Edition : 1st
Language : English
ISBN-13 : 9781787281394
Vendor :
Google
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Languages :

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Product Details

Publication date : Nov 24, 2017
Length: 670 pages
Edition : 1st
Language : English
ISBN-13 : 9781787281394
Vendor :
Google
Category :
Languages :

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Frequently bought together


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Total S$ 276.97
Go: Design Patterns for Real-World Projects
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Go Systems Programming
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Learning Functional Programming in Go
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Total S$ 276.97 Stars icon

Table of Contents

12 Chapters
Pure Functional Programming in Go Chevron down icon Chevron up icon
Manipulating Collections Chevron down icon Chevron up icon
Using High-Order Functions Chevron down icon Chevron up icon
SOLID Design in Go Chevron down icon Chevron up icon
Adding Functionality with Decoration Chevron down icon Chevron up icon
Applying FP at the Architectural Level Chevron down icon Chevron up icon
Functional Parameters Chevron down icon Chevron up icon
Increasing Performance Using Pipelining Chevron down icon Chevron up icon
Functors, Monoids, and Generics Chevron down icon Chevron up icon
Monads, Type Classes, and Generics Chevron down icon Chevron up icon
Category Theory That Applies Chevron down icon Chevron up icon
Miscellaneous Information and How-Tos Chevron down icon Chevron up icon

Customer reviews

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Rating distribution
Full star icon Full star icon Full star icon Full star icon Half star icon 4.1
(8 Ratings)
5 star 50%
4 star 25%
3 star 12.5%
2 star 12.5%
1 star 0%
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l3x Nov 30, 2017
Full star icon Full star icon Full star icon Full star icon Full star icon 5
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
Amazon Verified review Amazon
Akram Ahmad Aug 22, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
- 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!
Amazon Verified review Amazon
William Favorite Dec 16, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
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'.
Amazon Verified review Amazon
J. Kayser Sep 02, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
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.
Amazon Verified review Amazon
Donam Kim Dec 21, 2017
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
I will postpone my review until I finish it.
Amazon Verified review Amazon
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