Computer Science 面接の質問と回答
質問 41. What is the purpose of the 'Observer' design pattern?
The Observer design pattern defines a one-to-many dependency between objects, so that when one object changes state, all its dependents are notified and updated automatically.
Example:
Implementing event handling in graphical user interfaces.
質問 42. Explain the concept of the CAP theorem in distributed systems.
The CAP theorem states that in a distributed system, it is impossible to simultaneously provide all three guarantees: Consistency, Availability, and Partition tolerance.
Example:
Choosing between consistency and availability during network partitions in a distributed database system.
質問 43. What is the purpose of the 'OAuth' protocol in web development?
OAuth is an authentication and authorization protocol used for secure and delegated access, allowing a user to grant a third-party application limited access to their resources without exposing their credentials.
Example:
Allowing a mobile app to access a user's Google Drive without sharing the password.
質問 44. Explain the concept of the 'Decorator' design pattern.
The Decorator design pattern allows behavior to be added to an object, either statically or dynamically, without affecting the behavior of other objects from the same class.
Example:
Extending the functionality of a text editor with spell-checking or formatting capabilities.
質問 45. What is the purpose of the 'BFS' (Breadth-First Search) algorithm?
BFS is a graph traversal algorithm that visits all the vertices of a graph in breadth-first order, exploring all neighbors at the current depth before moving on to the next level.
Example:
Finding the shortest path in an unweighted graph or exploring the relationships in a social network.
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