Foundations
What is Composition Over Inheritance?
Build behavior by combining small objects instead of stacking deep parent classes.
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In real work
Composition over inheritance: we replaced a deep subclass tree with small composed helpers for logging and retry.
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Google gives a definition. Prompthaus pairs each term with how it shows up in standups, PRs, prompts, and design reviews—then quizzes you until the word sticks. One term a day on iPhone.