| name | javascript-ui-math |
| description | Use JavaScript number math safely for front-end UI behavior, including expressions, precedence, coercion, NaN, Infinity, floating-point precision, BigInt limits, modulo wrapping, rounding, random values, and repeatable UI randomness. Use when building sliders, carousels, counters, animation values, randomized UI, financial-ish display values, or debugging numeric edge cases in browser JavaScript. |
| license | MIT |
| compatibility | Codex, Claude Code, and other Agent Skills-compatible clients. |
| metadata | {"version":"0.1.0","displayName":"JavaScript UI Math","category":"Frontend","tags":"frontend,javascript,ui,math,debugging"} |
JavaScript UI Math
Use this skill for numeric browser behavior that needs predictable edge-case handling. It helps avoid common JavaScript traps around coercion, precision, modulo behavior, rounding, randomization, and BigInt.
Quick Start
- Read
guidelines.md to select the smallest relevant file set.
- Load
references/ui-numbers/rules.md for implementation decisions.
- Load
references/ui-numbers/examples.md when editing code.
- Use
workflows/debug-ui-number-logic.md for multi-step derivation or debugging.
Contents
| Resource | Purpose |
|---|
guidelines.md | Routes tasks to the right reference files |
references/source-map.md | Book source and chapter/section traceability |
references/ui-numbers/knowledge.md | Core concepts and terminology |
references/ui-numbers/rules.md | Practical rules, guidelines, and exceptions |
references/ui-numbers/examples.md | Bad/good examples and refactoring approach |
references/ui-numbers/patterns.md | Reusable formula and implementation patterns |
references/ui-numbers/checklist.md | Review checklist and red flags |
workflows/debug-ui-number-logic.md | Step-by-step workflow |
Source
Derived from Math for Web Design by Paul McFedries, Chapter 2: Math basics for JavaScript.
Citations are tracked in references/source-map.md.
