🔗 5 design patterns used in my new habit tracker app

Building a habit tracker is more than just an app; it demands innovative solutions. Bob Belderbos shares five clever design patterns he utilized in his new Django + HTMX habit tracker app, commitgraph. His approach emphasizes pure functions, making testing easier by keeping logic decoupled from dependencies like the database or user input. For instance, he employed a 7-bit integer to represent a habit's schedule, greatly simplifying data management. The article highlights how to efficiently use Python's standard library for month grid generation and introduces a custom QuerySet for cleaner queries. A standout feature is leveraging set algebra for filtering completed habits, making the code both concise and efficient. These patterns not only streamline habit tracking but also enhance code testability, making it a must-read for developers seeking practical insights into app design.