Book Image

Go Programming Cookbook - Second Edition

By : Aaron Torres
Book Image

Go Programming Cookbook - Second Edition

By: Aaron Torres

Overview of this book

Go (or Golang) is a statically typed programming language developed at Google. Known for its vast standard library, it also provides features such as garbage collection, type safety, dynamic-typing capabilities, and additional built-in types. This book will serve as a reference while implementing Go features to build your own applications. This Go cookbook helps you put into practice the advanced concepts and libraries that Golang offers. The recipes in the book follow best practices such as documentation, testing, and vendoring with Go modules, as well as performing clean abstractions using interfaces. You'll learn how code works and the common pitfalls to watch out for. The book covers basic type and error handling, and then moves on to explore applications, such as websites, command-line tools, and filesystems, that interact with users. You'll even get to grips with parallelism, distributed systems, and performance tuning. By the end of the book, you'll be able to use open source code and concepts in Go programming to build enterprise-class applications without any hassle.
Table of Contents (16 chapters)

Working with Unix pipes

    Unix pipes are useful when we are passing the output of one program to the input of another. For example, take a look at the following code:

              $ echo "test case" | wc -l
              
    1

    In a Go application, the left-hand side of the pipe can be read in using os.Stdin, which acts like a file descriptor. To demonstrate this, this recipe will take an input on the left-hand side of a pipe and return a list of words and their number of occurrences. These words will be tokenized on white space.

    How to do it...

    These steps cover writing and running your application:

    1. From your Terminal or console application,createa new directory called~/projects/go-programming-cookbook/chapter2/pipes.
    2. Navigate to this directory.
    3. Run the following command:
              $ go mod init github.com/PacktPublishing/Go-Programming-Cookbook-Second-Edition/chapter2...