Using _______ can help to synchronize goroutines in Go.
- Arrays
- Channels
- Mutexes
- Pointers
Using channels can help to synchronize goroutines in Go. Channels provide a way for goroutines to communicate and coordinate their execution safely without race conditions.
How can you skip running certain tests in Go unit testing?
- By commenting out the test functions.
- Go unit testing does not support skipping tests.
- Prefixing the test function name with 'skip_' keyword.
- Using the 't.Skip()' function inside the test.
In Go unit testing, you can skip the execution of certain tests by using the 't.Skip()' function inside the test function. When 't.Skip()' is called, the test is marked as skipped, and the execution moves to the next test. This feature is useful when you want to temporarily skip certain tests, perhaps due to incomplete implementation or known issues.
Which package in Go provides built-in support for templates?
- GoHTML
- GoTemplate
- html/template
- text/template
The html/template package in Go provides built-in support for templates. It is specifically designed for generating HTML output and includes features for automatic escaping of HTML, preventing common security vulnerabilities like XSS attacks. This package is commonly used in web applications built with Go.
Which Go command is used to run tests in a specific directory or package?
- go run ./directory_or_package
- go test -dir ./directory_or_package
- go test -run ./directory_or_package
- go test ./directory_or_package
To run tests in a specific directory or package in Go, the command 'go test ./directory_or_package' is used. This command tells the Go tool to execute tests found in the specified directory or package, allowing for targeted testing of specific components.
The '_______' function in Go is used to recover from panics within deferred functions.
- defer
- handle
- panic
- recover
The recover function in Go is used to recover from panics within deferred functions. When a function is called within a deferred function and panics, the recover function allows the program to regain control and resume normal execution. It returns the value passed to the call to panic, or nil if the function has not panicked.
In a large Go project, you need to represent employees with different roles and permissions. How would you structure your structs to accommodate this requirement?
- Create separate structs for each role such as Manager, Developer, etc., with duplicated fields for common attributes like name, age, etc., leading to potential redundancy.
- Define a base struct named Employee with common fields like name, age, etc., and then embed role-specific structs like Manager, Developer, etc., each containing fields relevant to their role and permissions.
- Use a single struct named Employee with a field to identify the role and additional fields representing permissions, which might result in a less scalable and maintainable design.
- Utilize interfaces named Role and Permission and then create structs implementing these interfaces for each role and permission, allowing for flexible assignment and extension of roles and permissions.
Embedding role-specific structs within a base Employee struct enables code reuse and ensures a clean and concise representation of different employee roles and permissions. It promotes modularity and scalability by allowing easy addition of new roles without affecting existing code.
In Go, error values are commonly checked against _______ to determine if they are non-nil.
- err
- error
- nil
- panic
In Go, error values are commonly checked against the error interface to determine if they are non-nil. The error interface is the built-in interface type in Go that represents an error condition. It is defined as type error interface { Error() string }, which means any type that implements a method Error() string satisfies the error interface.
In Go, what happens when a function calls 'panic()'?
- The function enters a recovery state and resumes execution after the panic is handled.
- The function enters a waiting state.
- The function execution halts and panics, then it starts unwinding the stack, running deferred functions, and returning to the calling function.
- The program terminates abruptly without executing any further code.
When a function calls 'panic()' in Go, it halts the normal execution flow, triggers a panic, and starts unwinding the stack, executing deferred functions along the way. This typically leads to program termination unless the panic is recovered.
In a performance-critical application, you need to frequently update values in a large map. Which map implementation would be most suitable for this scenario?
- Atomic map
- Concurrent map
- Regular map
- sync.Map
The sync.Map is optimized for performance and concurrency. It uses a fine-grained locking mechanism, allowing multiple readers and a single writer to access the map concurrently without blocking each other. This makes it ideal for performance-critical scenarios where frequent updates are required.
Can Gorilla Mux handle route parameters with different data types? If so, how?
- No, Gorilla Mux can only handle route parameters of the same data type.
- Yes, by converting all parameters to string data type.
- Yes, by defining separate routes for each data type.
- Yes, by using regular expressions in route patterns to specify data types.
Gorilla Mux can handle route parameters with different data types by using regular expressions in route patterns. Regular expressions allow you to specify patterns that match specific data types, such as integers or strings, for route parameters. This provides flexibility in handling various types of data in your routes.