The advantage of using Gorilla Mux over the default HTTP router in Go is its _______.
- Compatibility
- Flexibility
- Performance
- Simplicity
One of the key advantages of Gorilla Mux over the default HTTP router in Go is its flexibility. Gorilla Mux provides more advanced routing features, such as route patterns and constraints, which enhance flexibility.
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.
You are designing a system where a function needs to accept an arbitrary number of arguments and process them. Which type of function would you use?
- Anonymous function
- Callback function
- Recursive function
- Variadic function
Variadic functions in Go allow you to define functions that can accept a variable number of arguments. They are declared using an ellipsis (...) before the type of the last parameter in the function signature.
The _______ level determines the degree to which the operations of one transaction are isolated from those of other transactions.
- Atomicity
- Consistency
- Durability
- Isolation
Isolation level defines the degree of isolation between concurrent transactions. It specifies how much one transaction should be isolated from the effects of other concurrent transactions. Higher isolation levels typically result in fewer concurrency effects but can also lead to more locking and resource contention.
What are the potential drawbacks of using anonymous functions in Go?
- Difficulty in debugging
- Difficulty in writing unit tests
- Increased memory usage
- Readability issues
While anonymous functions offer flexibility and convenience, they also come with some potential drawbacks. One such drawback is readability issues, as the code might become less clear when using complex anonymous functions. Additionally, debugging anonymous functions can be challenging, especially when they're deeply nested or capture a large amount of external state.
The _______ package in Go provides functionalities for creating HTTP servers and clients.
- http
- http/client
- http/server
- net/http
The correct answer is net/http. This package in Go provides essential functionalities for working with HTTP servers and clients. It includes methods for creating HTTP servers, handling requests, and making HTTP requests to other servers. It is a fundamental package used in building web applications and services in Go. With the net/http package, you can easily create robust HTTP servers and clients with minimal effort, making it a core component of web development in Go.
You're working on a project using Gorm where you need to execute a complex SQL query that cannot be easily expressed using Gorm's methods. What approach would you take to handle this situation?
- Implement a stored procedure in the database and call it from the Go application using Gorm
- Use Gorm's built-in functions creatively to break down the query into smaller, manageable parts
- Use Gorm's custom query feature to create a custom method to handle the complex query
- Use Gorm's raw SQL feature to execute the SQL query directly
Gorm provides a feature called "raw SQL" which allows developers to execute SQL queries directly. This is useful for scenarios where Gorm's methods are insufficient to express the complexity of the query. Using raw SQL ensures compatibility with Gorm and leverages its connection management and mapping features.
Anonymous functions in Go are also known as:
- Closure functions
- Lambda functions
- Public functions
- Unnamed functions
Anonymous functions in Go are often referred to as unnamed functions because they lack a specific identifier or name. They can be defined inline without a name and are commonly used for tasks like defining callbacks or handling short-lived operations.
Gorilla Mux can handle route parameters with different data types by _______.
- Assigning a generic data type to route parameters
- Casting parameters to string
- Defining custom data types for each route parameter
- Using regular expressions in route patterns
Gorilla Mux can handle route parameters with different data types by using regular expressions in route patterns, allowing for more flexible and precise matching of URL patterns with specific data types.
The json.Marshal function in Go returns a ________ and an error.
- map
- slice
- byte
- []byte
The correct answer is option 4, "[]byte". The json.Marshal function in Go converts a Go data structure to JSON format and returns a []byte slice containing the JSON representation of the data along with an error, if any.