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  • Book Overview & Buying Learning Go Programming
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Learning Go Programming

Learning Go Programming

4.8 (5)
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Learning Go Programming

Learning Go Programming

4.8 (5)
Buy this Book

Overview of this book

The Go programming language has firmly established itself as a favorite for building complex and scalable system applications. Go offers a direct and practical approach to programming that let programmers write correct and predictable code using concurrency idioms and a full-featured standard library. This is a step-by-step, practical guide full of real world examples to help you get started with Go in no time at all. We start off by understanding the fundamentals of Go, followed by a detailed description of the Go data types, program structures and Maps. After this, you learn how to use Go concurrency idioms to avoid pitfalls and create programs that are exact in expected behavior. Next, you will be familiarized with the tools and libraries that are available in Go for writing and exercising tests, benchmarking, and code coverage. Finally, you will be able to utilize some of the most important features of GO such as, Network Programming and OS integration to build efficient applications. All the concepts are explained in a crisp and concise manner and by the end of this book; you would be able to create highly efficient programs that you can deploy over cloud.
Table of Contents (13 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. A First Step in Go
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1. A First Step in Go
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The Go programming language
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Playing with Go
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Your first Go program
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Go in a nutshell
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Summary
2
2. Go Language Essentials
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2. Go Language Essentials
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The Go source file
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Go identifiers
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Go variables
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Go constants
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Go operators
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Summary
3
3. Go Control Flow
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3. Go Control Flow
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The if statement
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Switch statements
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The for statements
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The break, continue, and goto statements
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Summary
4
4. Data Types
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4. Data Types
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Go types
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Numeric types
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Boolean type
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Rune and string types
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Pointers
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Type declaration
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Type conversion
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Summary
5
5. Functions in Go
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5. Functions in Go
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Go functions
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Passing parameter values
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Higher-order functions
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Error signaling and handling
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Deferring function calls
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Function panic and recovery
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Summary
6
6. Go Packages and Programs
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6. Go Packages and Programs
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The Go package
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Creating packages
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Building packages
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Package visibility
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Importing package
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Package initialization
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Creating programs
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Remote packages
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Summary
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7. Composite Types
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7. Composite Types
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The array type
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The slice type
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The map type
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The struct type
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Summary
8
8. Methods, Interfaces, and Objects
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8. Methods, Interfaces, and Objects
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Go methods
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Objects in Go
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The interface type
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Type assertion
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Summary
9
9. Concurrency
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9. Concurrency
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Goroutines
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Channels
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Writing concurrent programs
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The sync package
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Detecting race conditions
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Parallelism in Go
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Summary
10
10. Data IO in Go
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10. Data IO in Go
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IO with readers and writers
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The io.Reader interface
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The io.Writer interface
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Working with the io package
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Working with files
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Formatted IO with fmt
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Buffered IO
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In-memory IO
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Encoding and decoding data
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Summary
11
11. Writing Networked Services
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11. Writing Networked Services
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The net package
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A TCP API server
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The HTTP package
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A JSON API server
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Summary
12
12. Code Testing
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12. Code Testing
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The Go test tool
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Writing Go tests
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HTTP testing
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Test coverage
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Code benchmark
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Summary

Package initialization

When a package is imported, it goes through a series of initialization sequences before its members are ready to be used. Package-level variables are initialized using dependency analysis that relies on lexical scope resolution, meaning variables are initialized based on their declaration order and their resolved transitive references to each other. For instance, in the following snippet, the resolved variable declaration order in package foo will be a, y, b, and x:

package foo 
var x = a + b(a) 
var a = 2 
var b = func(i int) int {return y * i} 
var y = 3

Go also makes use of a special function named init that takes no arguments and returns no result values. It is used to encapsulate custom initialization logic that is invoked when the package is imported. For instance, the following source code shows an init function used in the resistor package to initialize function variable Rpi:

package resistor 
 
var Rpi func(float64, float64...
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Learning Go Programming
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