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Learning Functional Programming in Go

Learning Functional Programming in Go

By : Sheehan
4.1 (8)
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Learning Functional Programming in Go

Learning Functional Programming in Go

4.1 (8)
By: Sheehan

Overview of this book

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.
Table of Contents (13 chapters)
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Functional composition in the context of a legal obligation


Assume that Larry agreed to pay Lucy $5,000 by 1st October and that date has passed. Lucy wants to get paid $5,000 and Larry wants to pay her, but he does not have the money.

Should Lucy sue Larry to get him to pay?

The following category diagram describes their situation:

The category states are as follows:

  • A = Where we are today (12th October)
  • B = Lucy demands a lawsuit
  • C = Lucy gets paid

The category morphisms are as follows:

  • f =  Legal expense (for both, $2,000+)
  • g = Larry pays Lucy $5,000
  • h = Larry pays Lucy $5,000

Decisions determine state transitions

If Larry, in good faith, communicates the following to Lucy, which path will Lucy take?

To be clear, I'm simply asking for more time to pay or for you to allow me to make scheduled payments directly to you without going through the court system. Your thoughts? Larry

It's obvious that these two will eventually get from A to C, but which path is the shortest? Which path is more costly, both...

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