Go Interview Questions and Answers for freshers

1. What is Go?

   • Answer: Go, also known as Golang, is a statically-typed, compiled programming language designed at Google. It's known for its simplicity, concurrency features (goroutines and channels), and efficiency. It's often used for building network servers, cloud infrastructure, and command-line tools.

2. What are the key features of Go?

   • Answer: Key features include: concurrency support with goroutines and channels, garbage collection, built-in support for networking and concurrency, static typing, efficient compilation, and a simple syntax.

3. Explain goroutines and channels.

   • Answer: Goroutines are lightweight, concurrently executing functions. Channels are typed conduits used to communicate data safely between goroutines, preventing race conditions.

4. What is the difference between `make` and `new` in Go?

   • Answer: `new` allocates memory and returns a pointer to a zeroed value of the specified type. `make` allocates memory for slices, maps, and channels and returns an initialized value of that type.

5. What is a pointer in Go?

   • Answer: A pointer holds the memory address of a variable. It's declared using the `*` symbol (e.g., `*int`). Pointers allow you to modify variables indirectly.

6. Explain the concept of interfaces in Go.

   • Answer: Interfaces define a set of methods. Any type that implements all the methods of an interface implicitly satisfies that interface. This allows for polymorphism and decoupling.

7. How do you handle errors in Go?

   • Answer: Go uses multiple return values to handle errors. Functions typically return a value and an error. The error is checked using the `if err != nil` pattern.

8. What are structs in Go?

   • Answer: Structs are user-defined data types that group together fields of different types. They are similar to classes in object-oriented languages but without methods.

9. What are methods in Go?

   • Answer: Methods are functions associated with a specific type. They are declared using the `func` keyword followed by the receiver (a value or pointer of the type) and the method name.

10. Explain the concept of type assertion in Go.

    • Answer: Type assertion checks the concrete type of an interface value. It's used to access the underlying value of an interface variable of a specific type. It uses the syntax `value, ok := interface.(type)`

11. Explain the difference between `==` and `===` in Go.

    • Answer: Go doesn't have a `===` operator. `==` is used for equality comparison, which compares values. For pointers, it compares addresses.

12. What is the purpose of the `defer` keyword?

    • Answer: `defer` schedules a function call to be executed after the surrounding function returns. This is often used for cleanup tasks like closing files or releasing resources.

13. What is a package in Go?

    • Answer: Packages are collections of related source files. They provide modularity and reusability of code. The `main` package is the entry point for executable programs.

14. How do you handle concurrency issues in Go?

    • Answer: Goroutines and channels are the primary tools for concurrency. Proper use of channels prevents race conditions and ensures data consistency.

15. What are the different data types in Go?

    • Answer: Go supports various data types including integers (int, int8, int16, etc.), floating-point numbers (float32, float64), booleans (bool), strings (string), complex numbers, arrays, slices, maps, and structs.

16. What is a slice in Go?

    • Answer: A slice is a dynamic data structure that represents a segment of an underlying array. It provides flexibility in resizing and manipulating sequences of data.

17. What is a map in Go?

    • Answer: A map is a key-value data structure similar to a dictionary or hash table. Keys are unique, and values are associated with those keys.

18. What is the role of the `go build` command?

    • Answer: `go build` compiles the Go source code into an executable file.

19. What is the role of the `go run` command?

    • Answer: `go run` compiles and executes the Go source code directly without creating an executable file.

Thank you for reading our blog post on 'Go Interview Questions and Answers for freshers'.We hope you found it informative and useful.Stay tuned for more insightful content!