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Golang Skill Exam

1 / 20

1. What is a "channel" in Go?

Option: A communication mechanism for sending values between goroutines

Option: A data structure for storing ordered elements

Option: A way to connect to a remote server

Option: A mechanism for error handling

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2. What is the difference between `panic` and `error` in Go?

Option: `panic` indicates an unrecoverable error, while `error` indicates a recoverable error.

Option: `panic` should be used for user input validation, while `error` should be used for unexpected runtime errors.

Option: `error` is a built-in type, while `panic` is a function.

Option: Both a and c are correct.

3 / 20

3. How do you check if a key exists in a map?

Option: `if myMap.hasKey("key") { ... }`

Option: `if myMap.contains("key") { ... }`

Option: `if "key" in myMap { ... }`

Option: `if _, ok := myMap["key"]; ok { ... }`

4 / 20

4. What is the zero value of a boolean variable in Go?

Option: `null`

Option: `0`

Option: `false`

Option: `nil`

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5. Which keyword is used to create a new function in Go?

Option: `function`

Option: `def`

Option: `func`

Option: `create`

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6. What is the key difference between a `struct` and an `interface` in Go?

Option: A `struct` defines a collection of data, while an `interface` defines a set of behaviors (methods).

Option: A `struct` can only contain fields of the same type, while an `interface` can contain methods with different return types.

Option: A `struct` can have methods, while an `interface` cannot.

Option: A `struct` is a reference type, while an `interface` is a value type.

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7. What is the difference between buffered and unbuffered channels in Go?

Option: Buffered channels have a capacity to hold a certain number of values, while unbuffered channels can only hold one value at a time.

Option: Buffered channels are slower than unbuffered channels.

Option: Unbuffered channels are safer to use than buffered channels.

Option: Buffered channels are used for synchronization, while unbuffered channels are used for communication.

8 / 20

8. What is the purpose of the `init` function in Go?

Option: It's called before the `main` function to initialize package-level variables.

Option: It's used to handle errors.

Option: It's a special function that runs when a program exits.

Option: It's used to define methods on a struct.

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9. What is the purpose of the `defer` keyword in Go?

Option: To delay the execution of a function call until later

Option: To schedule a function call to run in the background

Option: To ensure a function call is executed even if an error occurs

Option: To return a value from a function immediately

10 / 20

10. What is the purpose of the `go test` command?

Option: To compile a Go program for testing

Option: To run tests written in Go's testing framework

Option: To analyze the performance of a Go program

Option: To generate documentation for a Go project

11 / 20

11. What is a "struct" in Go?

Option: A collection of data fields

Option: A function with a specific signature

Option: A way to group related functions

Option: A concurrent programming primitive

12 / 20

12. How does Go handle type assertions and type switches?

Option: Type assertions are used to convert an interface value to a specific type, while type switches are used to check the type of an interface value.

Option: Type assertions are used for compile-time type checking, while type switches are used for runtime type checking.

Option: Type assertions are safer than type switches.

Option: Type switches can be used with any data type, while type assertions can only be used with interfaces.

13 / 20

13. What does the `GOPATH` environment variable primarily refer to?

Option: The path to the Go installation directory

Option: The path to the project's binary executable

Option: The root directory of your Go workspace

Option: The path to Go's standard library

14 / 20

14. What is the purpose of the `go` keyword in Go?

Option: To compile a Go program

Option: To run a Go program

Option: To start a new goroutine (lightweight thread)

Option: To import a package

15 / 20

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

Option: `make` is used for built-in types like slices and maps, while `new` is used for user-defined types.

Option: `make` initializes and returns a value, while `new` returns a pointer to a zeroed value.

Option: Both a and b are correct.

Option: There is no difference; they are interchangeable.

16 / 20

16. What is the difference between `panic` and `recover` in Go?

Option: `panic` raises a runtime error, while `recover` stops the panicking goroutine.

Option: `panic` is used for error handling, while `recover` is used for logging.

Option: `panic` is a function, while `recover` is a keyword.

Option: `panic` stops the entire program, while `recover` only affects the current goroutine.

17 / 20

17. What is the correct way to declare a variable named "message" of type string in Go?

Option: `var message: string`

Option: `string message`

Option: `var message string`

Option: `message := string`

18 / 20

18. Which of the following is the correct way to define a constant in Go?

Option: `const PI = 3.14159`

Option: `define PI 3.14159`

Option: `final PI = 3.14159`

Option: `let PI = 3.14159`

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19. Which package is used for handling command-line arguments in Go?

Option: `os`

Option: `flag`

Option: `cli`

Option: `args`

20 / 20

20. What is the `GOMAXPROCS` environment variable used for in Go?

Option: It limits the maximum number of goroutines that can run concurrently.

Option: It sets the maximum number of operating system threads that can be used by the Go runtime.

Option: It controls the garbage collection frequency.

Option: It determines the size of the Go runtime's memory pool.

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Go is a statically typed, compiled high-level programming language designed at Google by Robert Griesemer, Rob Pike, and Ken Thompson. It is syntactically similar to C (Check your C Knowledge Skill), but also has memory safety, garbage collection, structural typing, and CSP-style concurrency.

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