Learning Functional Programming in Go

封面

版权信息

Credits

About the Author

Acknowledgments

About the Reviewer

www.PacktPub.com

Why subscribe?

Customer Feedback

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the example code

Downloading the color images of this book

Errata

Piracy

Questions

Pure Functional Programming in Go

Motivation for using FP

Getting the source code

The directory structure of the source files

How to run our first Go application

Imperative versus declarative programming

Pure functions

Fibonacci sequence - a simple recursion and two performance improvements

Memoization

The difference between an anonymous function and a closure

FP using Go's concurrency constructs

Testing FP using test-driven development

A note about paths

How to run our tests

A journey from imperative programming to pure FP and enlightenment

Benchmark test for the imperative SumLoop function

Benchmark test for the SumRecursive function

A time of reckoning

A quick example of a function literal

Summary

Manipulating Collections

Iterating through a collection

Piping Bash commands

Functors

Functions that modify functions

A coding example of functions that modify functions

A visual example of functions that modify functions

Composition in Mindcraft

Tacit programming

Tacit programming with Unix pipes

Programming CMOS with Unix pipes

Tacit programming with FP

Non-TCO recursive example

TCO recursive example

The importance of recursion

Various intermediate and terminal functions

Reduce example

Intermediate functions

Common intermediate functions

Map Example

Terminal functions

Common terminal functions

Join example

GroupBy example

Reduce example

Predicates

Reflection

Combinator pattern

Map and filter

Contains

Iterating over a collection of cars

The empty interface

The Contains() method

If Go had generics

Map function

Testing our empty interface-based Map function

Itertools

Go channels used by the New function

Testing itertool's Map function

Testing iterators for element equality

Functional packages

Another time of reflection

Go is awesome

Go is awesome but

The cure

Gleam - distributed MapReduce for Golang

LuaJIT's FFI library

Unix pipe tools

Processing Gleam collections

Summary

Using High-Order Functions

Characteristics of FP

Function composition

Monads allow us to chain continuations

Generics

First-class functions

Closure

Dynamically scoped

Pure function