Go Workspace Projects

This workspace contains a collection of Go projects, each focusing on a specific concept or feature of the Go programming language. The projects progress from fundamentals to advanced topics including REST APIs, concurrency, and full-stack applications.

---

Project Structure

01hello/

• Description: A simple "Hello, World!" program to get started with Go.
• Files: main.go

02variable/

• Description: Demonstrates variable declaration and usage in Go.
• Files: main.go

03userinput/

• Description: Handles user input and demonstrates how to read from the console.
• Files: go.mod, main.go

04conversion/

• Description: Covers type conversion in Go.
• Files: main.go

05mytime/

• Description: Explores working with time and dates in Go.
• Files: go.mod, main.go

06mypointers/

• Description: Introduces pointers and their usage in Go.
• Files: main.go

07array/

• Description: Demonstrates arrays and their operations in Go.
• Files: go.mod, main.go

08myslices/

• Description: Explains slices, a more flexible alternative to arrays in Go.
• Files: main.go

09mymaps/

• Description: Covers maps, a key-value data structure in Go.
• Files: main.go

10mystructs/

• Description: Introduces structs, a way to define custom data types in Go.
• Files: main.go

11ifelse/

• Description: Demonstrates conditional statements (if-else) in Go.
• Files: main.go

12switchcase/

• Description: Covers the switch statement for conditional logic in Go.
• Files: main.go

13loops/

• Description: Explains looping constructs like for in Go.
• Files: main.go

14functions/

• Description: Introduces functions and their usage in Go.
• Files: main.go

15methods/

• Description: Demonstrates methods and their association with structs in Go.
• Files: main.go

16defer/

• Description: Explains the defer statement and its use cases in Go.
• Files: main.go

17files/

• Description: Covers file handling, including reading and writing files in Go.
• Files: main.go, myfile.txt

18webrequests/

• Description: Demonstrates how to make HTTP web requests in Go.
• Files: main.go

19urls/

• Description: Explains working with URLs and parsing them in Go.
• Files: main.go

20tracker/

• Description: CLI expense tracker with JSON file persistence. Supports add, list, update, delete, and summary commands with optional month filtering.
• Files: main.go, expenses.json
• Usage: go run main.go [add|update|delete|list|summary] [flags]

21bitmorejson/

• Description: Advanced JSON encoding and decoding. Demonstrates struct tags (json:"coursename", json:"-", omitempty), Marshal/Unmarshal, and dynamic parsing with map[string]interface{}.
• Files: main.go

22mymod/

• Description: Introduces Go modules, go mod commands, and vendoring. Uses Gorilla Mux for basic HTTP routing with a simple home handler.
• Files: main.go, go.mod, go.sum, vendor/

23api/

• Description: REST API for a course catalog. Full CRUD operations using Gorilla Mux with in-memory storage.
• Endpoints: GET /, GET /courses, GET /course/{id}, POST /course, PUT /course/{id}, DELETE /course/{id}
• Files: main.go, go.sum
• Port: 4000

24context/

• Description: Demonstrates the context package for cancellation and timeouts. Uses context.WithTimeout to stop a goroutine after a specified duration.
• Files: main.go

25mongoapi/

• Description: MongoDB-backed API for a Netflix watchlist. CRUD operations for movies with MongoDB Atlas connection.
• Endpoints: GET /api/movies, POST /api/movie, PUT /api/movie/{id}, DELETE /api/movie/{id}, DELETE /api/deleteallmovie
• Files:
  • main.go – Entry point
  • controller/control.go – HTTP handlers and MongoDB operations
  • model/models.go – Netflix struct (ID, Movie, Watched)
  • router/routers.go – Route definitions
  • go.mod, go.sum
• Port: 4000

26goroutines/

• Description: Concurrent HTTP status checker using goroutines. Fetches status codes from multiple websites with sync.WaitGroup and sync.Mutex for thread-safe access.
• Files: main.go, go.mod

27mutexANDawaitgrp/

• Description: Demonstrates race conditions and synchronization. Uses sync.RWMutex (Lock/RLock) and sync.WaitGroup for safe concurrent reads and writes.
• Files: main.go, go.mod

28channels/

• Description: Introduces Go channels for goroutine communication. Covers buffered channels, send/receive-only channels, and closing channels.
• Files: main.go, go.mod, go.sum

todo-api/

• Description: Full REST API for todos with JWT authentication. Uses Gin, GORM, and SQLite.
• Files:
  • main.go – Entry point
  • config/config.go – Environment configuration
  • database/database.go – GORM/SQLite connection
  • controllers/auth_controller.go – Register, Login
  • controllers/todo_controller.go – CRUD for todos
  • middleware/auth.go – JWT authentication middleware
  • models/todo.go – Todo model
  • models/user.go – User model
  • routes/routes.go – Route registration
  • utils/jwt.go – JWT utilities
  • go.mod, go.sum, todo.db
• Endpoints: POST /register, POST /login, POST /todos, GET /todos, PUT /todos/:id, DELETE /todos/:id (protected)
• Port: 8080

---

How to Run

1. Navigate to the desired project directory.
2. For projects with go.mod, run:

   go mod tidy   # If dependencies need to be fetched
   go run main.go

3. For projects without go.mod, run from the workspace root or ensure the module path is correct:

   go run main.go

---

Quick Reference

Project	Topic	Key Concepts
01-04	Basics	Hello, variables, input, conversion
05-10	Data structures	Time, pointers, arrays, slices, maps, structs
11-16	Control flow & functions	if/else, switch, loops, functions, methods, defer
17-19	I/O & networking	Files, HTTP requests, URLs
20-21	JSON & CLI	JSON encoding/decoding, CLI apps
22-23	Modules & APIs	Go modules, REST APIs
24	Context	Cancellation, timeouts
25	MongoDB	NoSQL, MongoDB driver
26-28	Concurrency	Goroutines, mutex, channels
todo-api	Full application	Gin, GORM, JWT, SQLite