The Map Reducer
A medium Python mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- Python
- Difficulty
- medium
- Seniority
- L3
Interview Prompt
We receive transform rules over the wire as lambda source strings: a `mapper` that rewrites a single element and a `reducer` that folds two values into one. Given a list of `values` plus those two strings, turn each string into a callable, apply `mapper` to every element, and combine the mapped results into one value with `reducer`.
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 your python solution with real code execution
- Get instant feedback and a hire/no-hire decision