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Golang Skill Exam

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1. 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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2. What is the main use of the `go vet` command?

Option: It compiles Go code.

Option: It runs unit tests.

Option: It checks Go source code for potential errors and suspicious constructs.

Option: It formats Go code.

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3. What is the purpose of the `interface{}` type in Go?

Option: It represents any type of value.

Option: It's used to define interfaces.

Option: It's used to handle errors.

Option: It's a special type for nil values.

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

Option: `function`

Option: `def`

Option: `func`

Option: `create`

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5. 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.

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6. 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 { ... }`

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

Option: `os`

Option: `flag`

Option: `cli`

Option: `args`

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8. How does Go primarily achieve concurrency?

Option: By using threads managed by the operating system.

Option: By utilizing goroutines, which are lightweight threads managed by the Go runtime.

Option: By relying on asynchronous callbacks.

Option: By using futures and promises.

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9. What is the difference between a `goroutine` and a thread?

Option: Goroutines are managed by the Go runtime, while threads are managed by the operating system.

Option: Goroutines are more lightweight than threads.

Option: Goroutines communicate through channels, while threads communicate through shared memory.

Option: All of the above.

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10. 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.

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11. In Go, a pointer is...

Option: A variable that stores the memory address of another variable.

Option: A data type that represents a whole number.

Option: A function that returns a value.

Option: A way to group related data and functions.

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12. What is the Go equivalent of a constructor function in other languages?

Option: `new()`

Option: `init()`

Option: `create()`

Option: Go does not have constructors in the traditional sense.

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13. What is the primary difference between the `encoding/json` and `encoding/gob` packages in Go?

Option: `encoding/json` is used for encoding and decoding JSON data, while `encoding/gob` is used for encoding and decoding binary data.

Option: `encoding/json` is more efficient than `encoding/gob`.

Option: `encoding/gob` is only used for network communication, while `encoding/json` can be used for both file and network communication.

Option: There is no difference; they are interchangeable.

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14. 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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15. What is the difference between an array and a slice in Go?

Option: An array has a fixed length, while a slice is a dynamically sized view of an array.

Option: An array is a value type, while a slice is a reference type.

Option: Both a and b are correct.

Option: There is no difference; they are interchangeable.

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16. Which of the following is NOT a valid way to create a slice in Go?

Option: `[]int{1, 2, 3}`

Option: `make([]int, 5)`

Option: `slice(5)`

Option: `[]int{}`

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17. 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

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18. 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

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19. 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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20. 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.

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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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