GO Practice Test Video Answers

1. A  

Explanation: In Go, variables are declared using the `var` keyword followed by the variable name and its type.

2. B  

Explanation: The `defer` keyword schedules a function to run after the surrounding function completes, useful for cleanup operations.

3. A  

Explanation: The default value for a variable in Go is its zero value, with `0` for numeric types.

4. A  

Explanation: A constant in Go is declared using the `const` keyword, followed by the constant name and value.

5. B  

Explanation: The `go` keyword is used to launch a new goroutine, which allows functions to run concurrently.

6. A  

Explanation: The `len` function in Go returns the number of elements in a collection, such as an array or slice, and the return type is an integer.

7. C  

Explanation: Go handles errors using the return value of functions; errors are usually returned as the last return value.

8. B  

Explanation: The correct syntax for a Go `for` loop is `for i = 0; i < 10; i++ {}`.

9. B  

Explanation: An array in Go is a fixed-size collection of elements of the same type. Slices are flexible-sized.

10. B  

Explanation: Accessing an index outside of an array’s bounds in Go will result in a runtime panic.

11. B  

Explanation: A goroutine is a lightweight thread of execution in Go that runs concurrently with other goroutines.

12. D  

Explanation: To wait for a goroutine to complete, we use a `wait group` or a `channel` in Go.

13. C  

Explanation: Data is sent through a Go channel using the `<-channel` syntax.

14. C  

Explanation: The `make` function in Go creates and initializes slices, maps, and channels.

15. D  

Explanation: A map in Go is declared with the syntax `mapvalue`, where `key` and `value` are the types for the map.

16. B  

Explanation: Arrays are fixed-size collections in Go. A `slice` is more flexible and dynamically resizable.

17. A  

Explanation: Packages are imported using the `import “packageName”` syntax in Go.

18. C  

Explanation: The `fmt.Println` function is used to output text to the console, with a newline at the end.

19. A  

Explanation: Functions in Go are defined using the `func` keyword, followed by the function name and parameters.

20. A  

Explanation: Go’s concurrency is primarily handled using goroutines and channels.

21. A  

Explanation: The `select` statement in Go allows a goroutine to wait on multiple channels, selecting one that is ready.

22. B  

Explanation: An interface defines a set of methods a type must implement in Go, allowing polymorphism.

23. B  

Explanation: The `recover` function is used to handle a panic in Go, allowing the program to continue after a panic.

24. B  

Explanation: A struct in Go is a composite data type that groups together variables (fields) of different types.

25. C  

Explanation: To check if a key exists in a Go map, you check if `map != nil`.

26. B  

Explanation: The `strconv.Atoi` function is used to convert a string to an integer in Go.

27. B  

Explanation: The `defer` keyword delays the execution of a function until the surrounding function completes.

28. A  

Explanation: In Go, integer division truncates the result, so `10 / 3` gives `3`.

29. A  

Explanation: Pointers in Go are declared using the `&` operator, which provides the memory address of a variable.

30. B  

Explanation: The `strconv.Itoa` function is used to convert an integer to a string in Go.

31. A  

Explanation: A slice in Go is declared with `[]type{}` syntax, where `type` is the type of the elements.

32. C  

Explanation: The `…` syntax in a function parameter allows passing a variable number of arguments in Go.

33. A  

Explanation: The `new` keyword creates a pointer to a zero-initialized value of a specified type in Go.

34. A  

Explanation: Interfaces in Go define the methods that a type must implement, allowing the type to satisfy the interface.

35. A  

Explanation: In Go, strings are concatenated using the `+` operator.

36. B  

Explanation: The `break` statement exits a loop or a switch case completely in Go.

37. C  

Explanation: The zero value of a boolean type in Go is `false`.

38. A  

Explanation: Arrays in Go are automatically initialized with default values for their type, such as `0` for integers.

39. C  

Explanation: To close a channel in Go, the `close(channel)` function is used.

40. B  

Explanation: The `break` statement completely exits the current loop or switch block in Go.

41. A  

Explanation: In Go, strings are immutable, meaning their values cannot be directly modified.

42. B  

Explanation: Passing a pointer to a function allows the function to modify the original value in Go.

43. C  

Explanation: In Go, multiple return values can be handled by assigning them to separate variables.

44. C  

Explanation: Channels in Go are declared using the `make(chan type)` syntax, where `type` is the type of data the channel will carry.

45. A  

Explanation: To pass a struct by reference, you pass a pointer to the struct in Go.

46. A  

Explanation: Go supports multiple conditions in an `if` statement using `&&` (and) and `||` (or) operators.