Golang Interview Guide: 50 Essential Questions to Ace Your Interview

Preparing for a Go (Golang) interview? Here's a compilation of 50 interview questions that will help you cover a wide range of topics, from the basics to more advanced concepts.

Language Fundamentals

1. What is Go and why was it created?
2. How do you declare and initialize variables in Go?
3. What are the basic data types in Go?
4. What are slices and how are they different from arrays?
5. What is a map and how do you use it?
6. How do you handle strings in Go?
7. What are pointers and how do you use them?
8. Explain the defer statement.
9. What is the purpose of the init function?
10. How do you create constants in Go?

Functions and Methods

11. How do you write and call functions in Go?
12. Can you have variable-length arguments in a function?
13. What are function literals?
14. What is a method in Go and how is it different from a function?
15. How do you define and use interfaces in Go?
16. What is method overloading and does Go support it?
17. What is method overriding and does Go support it?

Concurrency

18. What is a goroutine and how do you create one?
19. What are channels and how do you use them?
20. What is a select statement and how does it work?
21. What are buffered channels?
22. How do you handle race conditions in Go?
23. What is the sync package and how is it used?
24. Explain the role of sync.Mutex and sync.RWMutex.
25. What are worker pools and how do you implement them in Go?

Error Handling and Debugging

26. How is error handling done in Go?
27. What are the common packages for logging in Go?
28. How do you use the panic and recover functions?
29. What are the best practices for handling errors in Go?

Advanced Topics

30. How do you create and use custom types in Go?
31. What are generic types and does Go support them?
32. How do you work with JSON in Go?
33. What are Go templates and how do you use them?
34. How do you perform dependency management in Go?
35. What is reflection and how do you use it in Go?
36. How do you handle file I/O in Go?
37. What are the key differences between Go and other languages like Python or JavaScript?

Development Tools and Practices

38. What is go fmt and why is it important?
39. What is go mod and how does it help with dependency management?
40. How do you write and run tests in Go?
41. What is go vet and how is it used?
42. How do you profile a Go application?
43. What are contexts and how are they used for managing timeouts and cancellations?
44. How do you use Go's built-in benchmarking tools?
45. What is the purpose of the vendor directory?

Real-World Scenarios

46. How do you build and deploy a Go application?
47. How do you handle configuration management in Go?
48. How do you implement a RESTful API in Go?
49. What are the considerations for writing high-performance Go applications?
50. What are some common Go libraries and frameworks used in industry?

Preparing answers to these questions will give you a comprehensive understanding of Go and its various features, equipping you well for your interview. Good luck!