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Coalesce Fields

A easy Python mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.

Domain
Python
Difficulty
easy

Interview Prompt

Our config loader uses a two-layer override pattern: a primary dict where some values may be None, and a defaults dict with fallbacks. Return a merged dict where any None in the primary is replaced by the corresponding value from defaults. Keys present only in defaults should also be included.

How This Interview Works

  1. Read the vague prompt (just like a real interview)
  2. Ask clarifying questions to the AI interviewer
  3. Write your python solution with real code execution
  4. Get instant feedback and a hire/no-hire decision