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Golang Skill Exam

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1. 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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2. 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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3. 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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4. 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

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5. 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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6. 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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7. What is the significance of the `iota` identifier in Go?

Option: It's used to define constants automatically within an `enum`.

Option: It represents the zero value of any type.

Option: It's a keyword for declaring an interface.

Option: It's used for error handling.

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8. What is a "method receiver" in Go?

Option: A variable that receives data from a channel.

Option: A special argument to a function that specifies the type the function operates on.

Option: A return value from a function.

Option: A mechanism for error handling.

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9. What is the purpose of the `sync` package in Go?

Option: To provide synchronization primitives like mutexes and waitgroups for concurrent programming.

Option: To handle file synchronization.

Option: To synchronize clocks between different machines.

Option: To manage database transactions.

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10. 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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11. Which of the following is the correct way to handle errors returned by a function in Go?

Option: `if err != nil { ... }`

Option: `try { ... } catch (err) { ... }`

Option: `throw err`

Option: `raise err`

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

Option: `os`

Option: `flag`

Option: `cli`

Option: `args`

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13. 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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14. 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.

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15. Which of the following is the correct way to create a map with string keys and integer values in Go?

Option: `map[string]int{}`

Option: `make(map<string, int>)`

Option: `new(map[string]int)`

Option: `HashMap<string, int>`

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16. Which package in Go is used for testing?

Option: `testing`

Option: `test`

Option: `go test`

Option: `unittest`

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17. 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

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18. 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

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19. 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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20. 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`

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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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