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Go by Example

Go by Example is a hands-on introduction to Go using annotated example programs. It’s designed to help you learn Go through practical, runnable code examples that demonstrate the language’s features and standard library.

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What is Go by Example?

Go by Example teaches Go via annotated example programs. Each example is a complete, working program that demonstrates a specific concept or feature of the language. The examples include:
  • Line-by-line code annotations explaining what each part does
  • Expected output showing what the program produces
  • Additional notes and best practices
With 85+ annotated examples, Go by Example covers everything from basic syntax to advanced concurrency patterns, standard library usage, and real-world programming tasks.

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Explore by Topic

Basics

Variables, constants, loops, conditionals, arrays, slices, maps, and functions

Methods & Interfaces

Structs, methods, interfaces, generics, and struct embedding

Concurrency

Goroutines, channels, select, worker pools, mutexes, and atomic operations

Standard Library

JSON, XML, HTTP, file I/O, regular expressions, time, and more

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How to Use This Site

Each example is structured to maximize learning:
  1. Read the Code - Every example starts with complete, runnable Go code
  2. Follow the Annotations - Inline comments explain each line and concept
  3. See the Output - Expected program output is shown after the code
  4. Try It Yourself - Copy and run the examples on your own machine
All examples are designed to work with modern Go versions. Check the Go release history for the latest version.

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What You’ll Learn

Go by Example covers the full spectrum of Go programming:

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Core Language

  • Basic types and control flow
  • Functions, closures, and recursion
  • Pointers, structs, and methods
  • Interfaces and generics
  • Error handling patterns

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Concurrency

  • Goroutines and channels
  • Channel buffering and synchronization
  • Select statements and timeouts
  • Worker pools and rate limiting
  • Mutexes and atomic counters

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Standard Library

  • String manipulation and formatting
  • JSON and XML processing
  • File and directory operations
  • HTTP clients and servers
  • Command-line arguments and flags
  • Testing and benchmarking

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Advanced Topics

  • Context for cancellation
  • Process spawning and signals
  • Regular expressions
  • Time handling and parsing
  • Custom iterators

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Getting Started

Ready to start learning Go? Head over to the Quickstart to install Go and run your first program, or jump straight into the examples starting with Hello World.

Quickstart Guide

Install Go and run your first program in minutes

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