Refactor a chat message processing function
Company: OpenAI
Role: Software Engineer
Category: Coding & Algorithms
Difficulty: hard
Interview Round: Technical Screen
Overview: This question evaluates a candidate's ability to refactor and implement clear, maintainable message-processing logic—covering code organization, command parsing, string trimming, state mutation, and edge-case handling in an in-memory chat store, and it tests competencies in coding, algorithms, and software engineering within the Coding & Algorithms category. It is commonly asked because it exposes a developer's capacity to produce deterministic, testable, and linear-time behavior while improving readability and maintainability in real-world backend message workflows, and its level of abstraction is primarily practical application with some conceptual design considerations.
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