What methods are available on the template object in Go for parsing and executing templates?
- Compile() and Execute()
- Parse() and Execute()
- ParseFiles() and Execute()
- ParseGlob() and ExecuteTemplate()
In Go, the template object provides methods like ParseFiles() for parsing templates from files and Execute() for executing parsed templates.
Type _______ in Go is used to assert the type of an interface value.
- assertion
- cast
- check
- switch
In Go, the type assertion is used to reveal the underlying concrete type of an interface. It allows you to extract the actual value stored in an interface and perform operations specific to that type. If the assertion fails at runtime, it triggers a panic, so it's essential to use it cautiously and handle potential failure cases gracefully.
You're designing a package in Go that deals with various shapes like circles, squares, and triangles. Which approach would you use to define a common behavior for these shapes?
- Use anonymous functions to encapsulate shape-specific logic.
- Use global variables to store shape information.
- Use interfaces to define a common behavior for the shapes.
- Use structs with embedded fields to inherit common behavior.
In Go, interfaces are a powerful tool for defining common behaviors across different types. By defining an interface with methods such as Area() or Perimeter(), each shape type can implement these methods according to its own logic. This approach allows for flexibility and polymorphism, enabling code to work with any shape that satisfies the interface contract. Using interfaces promotes cleaner code, decouples implementation details, and facilitates testing and extensibility.
What is the difference between the '=' and ':=' operators in Go?
- '=' is used for declaration only
- Assigns a value to a variable
- Both operators are used for assignment
- Declares and assigns a value to a variable
In Go, the '=' operator is used for assignment, while ':=' is a short variable declaration operator. The '=' operator assigns a value to a variable that already exists, whereas ':=' both declares and assigns a value to a new variable.
In NoSQL databases, data is typically stored in which format?
- Binary
- CSV
- JSON
- XML
NoSQL databases often store data in JSON format due to its flexibility, ease of use, and compatibility with modern web development technologies.
Maps in Go are declared using the syntax __________.
- var myMap map[keyType]valueType
- myMap := make(map[keyType]valueType)
- myMap := map[keyType]valueType{}
- myMap := map[keyType]valueType
In Go, maps can be declared using the make function or by using a composite literal. The second option (myMap := make(map[keyType]valueType)) is the correct syntax for creating an empty map.
In Go unit testing, what does the 'go test -v' command do?
- Displays verbose output, including the names of all tests being run.
- Executes only the tests marked with the verbose flag.
- Executes tests in a verbose mode and prints detailed logs of each test case.
- Increases the verbosity level of the testing framework.
The 'go test -v' command in Go unit testing is used to display verbose output. When this command is executed, it prints the names of all tests being run along with other relevant information. This verbose output can be helpful for debugging or understanding the progress of test execution.
Which testing framework provides advanced features such as assertions, mocks, and suites for writing tests in Go?
- go test
- gunit
- testify
- testing
"Testify" is a popular testing framework in Go that extends the capabilities of the standard testing package. It offers advanced features such as assertion methods, mock objects, and test suites, making it suitable for more complex testing scenarios.
Suppose you're building a microservices architecture with multiple services using Gorilla Mux for routing. How would you handle cross-origin requests (CORS) between services?
- Configure Gorilla Mux to include the necessary CORS headers in responses, allowing requests from specific origins using the "Handler" method.
- Implement a reverse proxy server to handle CORS requests and forward them to the appropriate microservices, bypassing the need for CORS headers in Gorilla Mux.
- Use WebSocket connections instead of HTTP requests to communicate between microservices, avoiding CORS issues altogether.
- Utilize JSON Web Tokens (JWT) for authentication between microservices, eliminating the need for CORS handling.
Handling CORS between microservices in Gorilla Mux involves configuring the router to include the required CORS headers in responses. This allows cross-origin requests from specific origins, ensuring secure communication between services. Implementing a reverse proxy or using JWTs may not directly address CORS issues, and WebSocket connections serve a different purpose compared to HTTP requests.
When importing a package in Go, if we want to execute its init functions, we use the _________ form of the import statement.
- deferred
- blank
- named
- inline
The correct option is "blank". In Go, if you want to execute the init functions of a package without directly using its exported symbols, you can use the blank identifier _ in the import statement. This signals to the compiler that you're importing the package solely for its side effects, such as initializing global variables or setting up the environment.