Reflex

Reflex UI Skill

Use this skill whenever the task involves Reflex UI code (ui/*.py), rx components, state vars, event handlers, or front-end layout/styling issues.

Quick rules

• Never use Python if/else with state vars in component trees. Use rx.cond or rx.match.
• Never use Python for loops over state vars in component trees. Use rx.foreach.
• Var operations use bitwise operators: &, |, ~ for logic.
• Selects: use rx.select(["a", "b"]) or the rx.select.root family (no rx.option).
• Responsive: prefer rx.breakpoints(...) on props (e.g., columns=rx.breakpoints(...)).
• Layout: use rx.grid for grids, rx.flex for rows/columns.

When debugging compile errors

1. Look for VarTypeError or "Cannot convert Var to bool" and replace if/or/and with rx.cond / & / | / ~.
2. If a list/iterable is a state var, render it with rx.foreach (do not join() or list‑comprehend in Python).
3. For responsive direction/columns, use rx.breakpoints instead of lists.

Reference files

• Library component patterns: references/library.md
• Conditional + foreach rules: references/components.md
• Responsive rules + breakpoints: references/styling.md
• State vars + setters guidance: references/state.md
• Examples & patterns from /Users/eric/git/reflex-examples: references/examples.md