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Golang Skill Exam

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1. What is the purpose of the `select` statement in Go?

Option: To choose a random element from a slice

Option: To select a case based on a boolean condition

Option: To manage communication operations on multiple channels

Option: To filter elements in a slice

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2. What is the purpose of closures in Go?

Option: To create anonymous functions that can capture values from their surrounding scope.

Option: To define interfaces.

Option: To handle errors.

Option: To create custom data types.

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3. 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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4. How does Go's garbage collector work?

Option: It manually frees memory allocated to variables when they go out of scope.

Option: It automatically tracks and frees memory that is no longer referenced.

Option: It requires explicit memory deallocation by the developer.

Option: It doesn't have a garbage collector.

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5. 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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6. What is the purpose of the `go fmt` command?

Option: To format Go code according to standard conventions

Option: To compile a Go program

Option: To run a Go program

Option: To generate documentation for a Go project

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7. 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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8. 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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9. 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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10. Which package is used for handling command-line arguments in Go?

Option: `os`

Option: `flag`

Option: `cli`

Option: `args`

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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

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12. Which package in Go is used for testing?

Option: `testing`

Option: `test`

Option: `go test`

Option: `unittest`

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13. 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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14. 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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15. What is the idiomatic way to iterate over a map in Go?

Option: `for i := 0; i < len(myMap); i++ { ... }`

Option: `for key, value := range myMap { ... }`

Option: `for key in myMap { ... }`

Option: `myMap.forEach((key, value) => { ... })`

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16. How do you write a benchmark in Go?

Option: By creating a function that starts with the prefix `Test` and takes a `testing.B` argument.

Option: By creating a function that starts with the prefix `Benchmark` and takes a `testing.B` argument.

Option: By using the `go test -bench` command.

Option: Both b and c are correct.

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17. 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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18. What is the purpose of the `reflect` package in Go?

Option: It's used for reflection, allowing you to inspect and manipulate types and values at runtime.

Option: It's used for parsing and generating JSON data.

Option: It's used for building command-line interfaces.

Option: It's used for error handling.

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19. 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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20. 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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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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