GUIDED PRACTICE

SOLID and composition

Design for a concrete change that is likely to happen.

A AceYourInterviews editorial · 8 min study

8:00Self-guided practice timer

The timer resets when you leave this page. Save your design separately.

Your challenge

Refactor a notifier that hardcodes both email and SMS.

Your design draft

Clarify assumptions, explain your approach, and test the difficult cases. Save your draft, then compare it with the study notes.

Self-review checklist

I clarified the requirements and constraints.I explained why the approach works.I considered failures, boundaries, and alternatives.I identified one improvement for my next attempt.

Self-guided practice. Automated AI feedback and code execution are not connected.