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Golang Skill Exam

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1. 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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2. 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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3. Which package is used for handling command-line arguments in Go?

Option: `os`

Option: `flag`

Option: `cli`

Option: `args`

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4. 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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5. 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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6. What is the purpose of the `context` package in Go?

Option: To provide a way to pass request-scoped values, deadlines, and cancellation signals between goroutines.

Option: To handle file I/O operations.

Option: To manage database connections.

Option: To parse command-line arguments.

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7. What is the difference between `cgo` and `SWIG` in the context of Go?

Option: `cgo` is a tool for calling C code from Go, while `SWIG` is a tool for generating bindings for C/C++ libraries to various languages.

Option: `cgo` is used for building Go programs, while `SWIG` is used for building C/C++ programs.

Option: `cgo` is a Go package, while `SWIG` is a third-party tool.

Option: Both a and c are correct.

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8. 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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9. 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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10. 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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11. 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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12. 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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13. 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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14. 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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15. 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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16. 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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17. 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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18. Which package in Go is used for testing?

Option: `testing`

Option: `test`

Option: `go test`

Option: `unittest`

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19. 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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20. 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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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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