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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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Example implementations


Now that we see the value in the pipeline pattern, let's start planning a Go implementation of one.

In Go, pipelines are implemented using a series of stages connected by Go channels. A Go pipeline begins with a data source (aka producer), has stages that are connected via channels, and ends with a data sink (aka consumer).

The data source can be a generator function that sends data to the first stage and then closes the initial outbound channel.

Each filter (step or stage) in the pipeline:

  • Consists of one or more Goroutines that run the same function (aka filter)
  • Receives upstream data via one or more inbound channels
  • Transforms the data in some way
  • Sends data downstream via one or more outbound channels
  • Closes its outbound channels when all the send operations are completed
  • Keeps receiving values from inbound channels until those channels are closed

Example transformer functions include the following: 

  • Accumulator
  • Aggregator
  • Delta (to calculate the change between two sample...

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