The Map Reducer
A medium Python mock interview question on DataDriven, with an AI interviewer who asks follow-up questions and a hire or no-hire decision at the end.
- Domain
- Python
- Difficulty
- medium
- Seniority
- L3
Interview Prompt
Our batch-job toolkit needs a small helper that takes numeric `values` plus the names of a `mapper` and a `reducer`: every value goes through the mapper, then the mapped values collapse into one result through the reducer. Mappers are "double", "square", "increment" and "identity"; reducers are "add", "subtract" and "multiply".
Summary
Map it. Reduce it. One answer.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write and run your Python against test cases
- Answer the interviewer's follow-up questions, then get a hire or no-hire decision