The _________ keyword in Go is used to import a package without directly using its exported identifiers.
- include
- import
- require
- use
The correct option is "import". In Go, the import keyword is used to import packages into the current file. When importing a package, you can choose to import it without directly referencing its exported identifiers by using the blank identifier _. This allows you to execute the package's init functions without explicitly using its exported symbols.
In Go, can you declare multiple variables in a single declaration statement?
- Depends on the context
- No
- Sometimes
- Yes
Yes, Go allows declaring multiple variables in a single declaration statement using the syntax var a, b int. This helps in writing concise and readable code by reducing repetitive declarations.
What is a type assertion in Go interfaces?
- Asserting the type of a variable
- Checking the type of a variable
- Converting a variable to another type
- Declaring a new data type
In Go, a type assertion is used to determine the actual type of an interface variable at runtime. It checks whether the dynamic type of an interface variable is identical to the asserted type.
In Go, which loop is used to iterate over elements in an array, slice, string, or map?
- for loop
- foreach loop
- range loop
- while loop
The range loop in Go is used to iterate over elements in an array, slice, string, or map. It provides a concise syntax for iterating over collections and is commonly used in Go for such purposes.
You're leading a project that requires extensive testing with a large number of test cases and the need for test parallelization. Which testing framework in Go would you recommend to ensure efficient testing?
- Ginkgo
- GoConvey
- Gomega
- Testify
Ginkgo stands out in scenarios requiring extensive testing and parallelization due to its built-in support for parallel test execution. Ginkgo's parallel test runner allows you to run tests concurrently, which can significantly reduce the overall test execution time, especially when dealing with a large number of test cases. This makes Ginkgo a preferred choice for projects where efficient testing is a priority.
In Go, what is the role of the 'panic' function in error handling?
- Halts the program and logs the error message.
- Resumes execution after a deferred function completes.
- Terminates the program immediately, unwinding the stack.
- Throws an error message and continues program execution.
The 'panic' function in Go is used to abruptly terminate the program by unwinding the stack. When called, it stops the normal execution flow and starts to panic, which means it walks back up the stack, executing any deferred functions along the way, and then exits the program. Panicking is typically used to indicate that the program has encountered a situation it cannot recover from, such as a critical error or an unexpected condition.
In the database/sql package, what method is used to execute a SQL query that returns rows?
- Query
- Execute
- ExecuteQuery
- Fetch
The correct option is Query. In Go's database/sql package, the Query method is used to execute a SQL query that returns rows from the database. This method is commonly used for SELECT queries.
What does the '==' operator do in Go when used with slices?
- Checks if both slices point to the same underlying array
- Compares the elements of the slices
- Compares the lengths of the slices
- It is not a valid operator to use with slices in Go
The '==' operator in Go when used with slices checks if both slices point to the same underlying array. It does not compare the elements or the lengths of the slices, only the reference to the underlying array.
In Go, a _______ is a function that runs concurrently with other functions.
- Closure
- Goroutine
- Interface
- Method
A goroutine is a lightweight thread of execution in Go that enables concurrent execution of functions. It allows functions to run concurrently with other functions without blocking the execution flow, making it efficient for handling concurrent tasks.
What is the primary purpose of unit tests in Go?
- To document the codebase effectively.
- To ensure that the entire application is functioning properly.
- To optimize the performance of the Go program.
- To verify that individual units of source code are working correctly.
Unit tests in Go serve the primary purpose of verifying that individual units of source code, typically functions or methods, are working correctly. They help in identifying and fixing bugs early in the development cycle, ensuring the reliability and stability of the codebase.