The First Class Function
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
- L4
Interview Prompt
Implement two functions: apply_twice(f, x) returns f(f(x)); compose(f, g) returns lambda x: f(g(x)). The test harness calls test cases with 'f', 'g', 'x', 'op' and a registry of named functions ('double' = x*2, 'inc' = x+1). Return the list of results.
Summary
Functions travel as values - prove you can pass one around.
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