The Change Tracker
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're diffing two snapshots of a records table, `old_records` and `new_records`, each a list of dicts keyed by `id`. Return a dict that groups the ids into the ones that were added, the ones that were removed, and the ones present in both snapshots whose record changed.
Summary
Before and after snapshots. The delta is in there.
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