Learning Go

This repository contains the code snippets, mini projects, and exercises that accompany my Go course.
Each *section directory mirrors a module in the course, so you can jump straight to the topic you are studying and run the examples locally.

Getting Started

• Install Go 1.24 or newer (see go.mod).
• Clone the repo and run examples with go run from the project root, for example:

  go run ./3section/2-slices
  

• Execute all tests with:

  go test ./...
  

Some folders (notably 12section) rely on SQLite (github.com/mattn/go-sqlite3). Building those examples requires a C toolchain. Networking examples in 16section call https://dummyjson.com/, so they need outbound internet access unless you stub the client.

Course Outline

Directory	Focus
1section	Language basics: variables, constants, iota-style enums, and the first CLI project.
2section	Control flow with for, if/else, and switch, plus a small challenge project.
3section	Collections and pointers: arrays, slices, maps, slice tricks, and a capstone exercise.
4section	Functions and error handling: multi-return, variadics, custom errors, defer, panic, and recover.
5section	Working with types: structs, methods, interfaces, custom Stringers, generics, and a section project.
6section	Composition and embedding patterns that model richer domain types.
7section	Strings: Unicode, formatting, regex workflows, and Go templates.
9section	Concurrency fundamentals: goroutines, wait groups, channels (buffered/unbuffered), closing patterns, a downloader project, and race detection.
10section	File system utilities: reading/writing files, walking directories, temporary files, and the embed package.
11section	Encoding and decoding: JSON marshalling/unmarshalling, streaming with encoders/decoders, and Base64 helpers.
12section	Working with databases: connecting to SQLite, running queries, prepared statements, transactions, and a repository pattern. Sample databases live alongside the exercises.
14section	Testing patterns: capturing stdout, HTTP handler tests, and using stretchr/testify assertions.
15section	Time utilities: parsing/formatting, timers, tickers, randomness, scheduling, and time zone conversions.
16section	HTTP clients and testability: fetching remote data, refactoring for dependency injection, manual mocks, table-driven tests, and testify/mock.

SQLite sample databases (data.db, users_database.db) are included for convenience.

Working Through the Material

1. Pick the section that matches the lesson you just watched.
2. Run the example programs (go run ./path/to/example) to observe the behaviour.
3. Open the accompanying tests (*_test.go) to see idiomatic testing approaches.
4. Experiment by extending the snippets. Each directory is self-contained, so you can iterate freely.

Happy hacking!