Hands-on Go — Advancing with Practical Examples

Allison Yuri — Tue, 24 Jun 2025 20:13:45 +0000

👋 Hello, everyone!

After the first post covering the initial four examples in gostart, I've added four more use cases that mirror real-world challenges you'll face with Go. Let's dive into what's been added!

📂 Updated Structure

gostart
┣ exemplos
┃ ┣ 01_hello
┃ ┣ 02_arguments
┃ ┣ 03_duplicates
┃ ┣ 04_animated_gif
┃ ┣ 05_http_requests
┃ ┣ 06_concurrency_channels
┃ ┣ 07_file_manipulation
┃ ┗ 08_api_integration
┗ README.MD

Each folder contains a main.go and a README.md that walks you through the steps.

✅ 05 - HTTP Requests

What was added:

Consuming REST APIs with GET and POST
JSON handling (json.Marshal / json.Unmarshal)
Using http.NewRequest and customizing headers
Configuring http.Client with a timeout

Why it matters:
In real applications, you'll fetch and send data to external services—so mastering HTTP requests is essential.

✅ 06 - Concurrency & Channels

What was added:

Spawning goroutines for parallel tasks
Communicating via channels (buffered and unbuffered)
Synchronizing with sync.WaitGroup
Multiplexing channels with select and default
A worker pool pattern

Why it matters:
Go is built for concurrency—these examples show you how to scale work safely and efficiently.

✅ 07 - File Manipulation

What was added:

Reading and writing text and binary files (os, bufio, io)
Copying files with io.Copy
Processing CSV (encoding/csv) and JSON (encoding/json)
Walking directories and gathering metadata (filepath.WalkDir, os.DirEntry)

Why it matters:
Backend logic often involves file I/O—whether logs, data imports, or configuration files.

✅ 08 - API Integration

What was added:

Structuring a custom API client with an interface for easy testing
Authentication via headers (API Key / Bearer Token)
Timeout and cancellation control with context
Exponential backoff retry on 5xx errors
Robust error handling with wrapped context

Why it matters:
In corporate projects, you'll integrate with paid or internal services—these patterns are production-grade.

🚀 How to Get Started

Clone the repository or update your fork:

git clone https://github.com/TheZehel/gostart.git
cd gostart/exemplos

Choose one of the new directories (05_http_requests, 06_concurrency_channels, etc.)
Read the README.md to understand the flow, then run:

go run main.go

🤝 Contributions

Want to help enrich gostart?

Create a folder 0X_example_name/ following the same convention
Include main.go with well-commented code and README.md with clear explanations
Suggested topics: databases, gRPC, interactive CLIs, automated tests, microservices…
Open a PR and let's grow this repository together! 💪

💬 Questions, suggestions, or feedback? Leave a comment below.

Let's keep learning by doing! 🚀

Hands-on Go — Learn by Doing with Realistic Examples

Allison Yuri — Wed, 11 Jun 2025 14:50:27 +0000

👋 Hi everyone!

I'm Allison Yuri, 26 years old, currently working as a Tech Lead at Prime Secure.

I'm passionate about technology, politics, blockchain, cybersecurity, and philosophy.

🎯 Why am I here?

I started posting on DEV Community to share practical and accessible knowledge for those who want to get into programming — especially with the Go language.

🚀 Project: gostart

🔗 GitHub Repository

gostart is an open and collaborative repository aimed at teaching Go through straightforward, well-commented, and structured examples.

Each example lives in its own folder, with a main.go file and an explanatory README.md.

The goal is to learn by doing, reading, and testing.

📂 Current Structure

✅ 01_hello

Your first contact with Go — the classic Hello, World! — with explanations on package main, func main(), and fmt.Println.

✅ 02_arguments

How to capture command-line arguments using os.Args and strings.Join.

✅ 03_duplicates

Reading from the terminal using bufio.Scanner, using maps to count values, and logic to display only duplicate lines.

✅ 04_animated_gif

Generating animated images with image/gif, graphic loops, sine functions, and Lissajous curve GIFs.

📌 What's coming next?

The repository will be continuously updated with new examples such as:

HTTP requests (net/http)

Concurrency with goroutines and channels

File manipulation

Real-world API integrations

🤝 Contributions are welcome!

If you’d like to help teach Go, feel completely free to send pull requests with new examples following the current structure:
examples/
└── 0X_example_name/
    ├── main.go
    └── README.md

💬 Feel free to comment, suggest improvements, or ask anything.

Let’s learn together! 🚀

DEV Community: Allison Yuri

Hands-on Go — Advancing with Practical Examples

📂 Updated Structure

✅ 05 - HTTP Requests

✅ 06 - Concurrency & Channels

✅ 07 - File Manipulation

✅ 08 - API Integration

🚀 How to Get Started

🤝 Contributions

Hands-on Go — Learn by Doing with Realistic Examples