Can a struct implement multiple interfaces in Go?
- No, a struct can only implement one interface in Go.
- Yes, a struct can implement multiple interfaces in Go.
- Yes, but only if those interfaces have different methods.
- Yes, but only if those interfaces have the same methods.
Yes, a struct in Go can implement multiple interfaces. This enables flexible code design where a single struct can fulfill the requirements of different interfaces, enhancing code reuse and modularity.
The _______ method in the database/sql package is used to close a database connection.
- Close
- Exec
- Query
- Prepare
The correct option is Close. In Go's database/sql package, the Close method is used to close a database connection. It's important to close the connection properly to release resources and avoid leaks.
Which function is commonly used in Go to handle errors by logging them and exiting the program?
- errors.New
- fmt.Println
- log.Fatal
- panic
In Go, the function commonly used to handle errors by logging them and exiting the program is 'log.Fatal'. This function logs the error message and terminates the program.
In Go's database/sql package, the _______ method is used to begin a transaction.
- BeginTransaction()
- InitiateTransaction()
- OpenTransaction()
- StartTransaction()
The correct method to begin a transaction in Go's database/sql package is Begin(). This method returns a Tx object representing the transaction. It's crucial to initiate a transaction before executing multiple SQL statements to ensure atomicity and consistency. The Begin() method initializes and returns a Tx object, allowing you to execute SQL statements within the transaction scope.
You're developing a high-performance application that requires handling large sets of floating-point numbers with the highest precision possible. Which data type would you use for this purpose?
- decimal
- double
- float32
- float64
The float64 data type provides the highest precision for floating-point numbers in Go. It is suitable for handling large sets of floating-point numbers with the utmost precision, crucial for high-performance applications.
The _______ testing framework in Go is known for its simplicity and ease of use, especially for beginners.
- Ginkgo
- Gomock
- Gotest
- Gunit
Gotest, also known as the Go testing package, is the standard testing framework in Go. It is simple to use and comes bundled with the Go programming language. Gotest is widely used and is suitable for beginners.
Monitoring _______ metrics is essential for identifying and resolving connection pool issues.
- Latency
- Performance
- Throughput
- Utilization
Monitoring utilization metrics of the connection pool provides insights into its efficiency and capacity usage, enabling timely resolution of issues to maintain optimal performance.
You're developing a web application in Go and encounter a runtime panic due to a nil pointer dereference. How would you handle this error gracefully?
- Check for nil pointers explicitly before dereferencing.
- Implement error logging and recovery mechanisms.
- Return an error value indicating the nil pointer.
- Use defer and recover to catch and handle the panic.
Handling nil pointer dereference errors gracefully in Go requires explicit checking for nil pointers before attempting to dereference them. This helps avoid runtime panics. Implementing error logging and recovery mechanisms can also aid in gracefully handling such errors and preventing application crashes.
The _______ operator in Go is used to dereference a pointer and access the value it points to.
- &
- *
- ->
- .
The '*' operator in Go is used for pointer dereferencing. It allows access to the value stored at the memory address pointed to by the pointer. For example, if 'ptr' is a pointer, '*ptr' accesses the value it points to.
Which Go package is commonly used for writing unit tests?
- "go.test"
- "test"
- "testing"
- "unittest"
The "testing" package is commonly used for writing unit tests in Go. It provides various functions and utilities for creating and running tests, defining test cases, and asserting expected outcomes.