In OAuth, the _______ role is responsible for authorizing access to protected resources.
- Authorization Server
- Client
- Resource Owner
- Resource Server
In OAuth, the Authorization Server is responsible for authorizing access to protected resources. It authenticates the resource owner and issues access tokens to clients after successful authorization. The authorization server plays a crucial role in ensuring secure access to protected resources while maintaining user privacy and control over their data.
What is the purpose of pointer receivers in Go methods?
- To allow modification of the receiver
- To avoid memory leaks
- To improve performance
- To restrict access
Pointer receivers allow methods to modify the receiver's state, which can be necessary when the receiver is a struct or another complex type that needs to be modified.
The _______ statement in Go is used to specify a condition in a switch statement.
- case
- default
- select
- if
The correct option is "case". In Go, the "case" statement is used within a switch statement to specify different conditions that are to be evaluated. When the expression in the switch statement matches one of the cases, the corresponding block of code associated with that case is executed. The "case" statement is crucial for implementing multi-way branching logic in Go, allowing the execution of different code blocks based on the value of a variable or expression.
In Go, a function can return multiple _______.
- Arguments
- Errors
- Types
- Values
In Go, a function can return multiple values using a feature called "multiple return values". This allows a function to return more than one result to the caller, which can be useful in various scenarios.
In a concurrent Go program, one of the goroutines encounters an error. How would you ensure that the error is appropriately handled without affecting other goroutines?
- Implement a global error variable for error tracking.
- Implement error handling locally within each goroutine.
- Use channels to communicate errors between goroutines.
- Utilize sync.Mutex to synchronize error handling across goroutines.
Using channels to communicate errors between goroutines ensures that errors are appropriately handled without impacting other goroutines. This approach promotes isolation and allows for selective error handling in each goroutine, maintaining concurrency and program stability.
Which Go package is commonly used to encode and decode JSON?
- bufio
- encoding/json
- fmt
- io
The encoding/json package in Go is commonly used for encoding and decoding JSON data. It provides functions like Marshal and Unmarshal for converting Go data structures to and from JSON format.
Which type of transaction isolation level allows a transaction to see changes made by other transactions that have not yet been committed?
- Read Committed
- Read Uncommitted
- Repeatable Read
- Serializable
The "Read Uncommitted" isolation level allows a transaction to see changes made by other transactions that have not yet been committed. This means that transactions can read data that may be inconsistent or uncommitted, potentially leading to dirty reads or non-repeatable reads. It offers the lowest level of isolation among the isolation levels defined in SQL.
Database locks are essential for maintaining _______ in multi-user environments, but they can also introduce bottlenecks and reduce scalability.
- Concurrency Control
- Data Availability
- Data Consistency
- Data Integrity
Concurrency control mechanisms such as database locks are crucial for maintaining data consistency in multi-user environments. They ensure that multiple users can access and modify data concurrently without causing conflicts or inconsistencies. However, excessive use of locks can lead to bottlenecks and reduce scalability as they may block other users from accessing data, impacting system performance.
Redis is often referred to as a _______ store.
- Document
- Graph
- Key-value
- Relational
Redis is commonly referred to as a key-value store because it stores data in a simple key-value mapping, making it efficient for caching, real-time analytics, and session management.
You have a Go struct with a field that should be treated as a string when encoded to JSON, but as an integer when decoded. How would you achieve this?
- Define separate struct types for encoding and decoding purposes and convert between them as needed.
- Implement custom encoding and decoding methods for the struct.
- Use struct tags json:"fieldname,omitempty" to specify the JSON encoding and decoding behavior.
- Utilize the json.Marshal and json.Unmarshal functions with custom logic for the specific field.
Struct Tags in Go provide a concise way to specify encoding and decoding behavior for struct fields. By using json:"fieldname,omitempty", you can instruct the JSON encoder to treat the field as a string when encoding to JSON and as an integer when decoding. This approach ensures clarity and maintainability in your code.