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.
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---
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."
category: frontend-and-design
source_repo: hashgraph-online/awesome-codex-plugins
source_path: "plugins/LVTD-LLC/skills/skills/javascript-ui-math/SKILL.md"
source_url: https://github.com/hashgraph-online/awesome-codex-plugins/blob/HEAD/plugins/LVTD-LLC/skills/skills/javascript-ui-math/SKILL.md
---
# 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
1. Read `guidelines.md` to select the smallest relevant file set.
2. Load `references/ui-numbers/rules.md` for implementation decisions.
3. Load `references/ui-numbers/examples.md` when editing code.
4. 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`.
---
**Source:** [`hashgraph-online/awesome-codex-plugins`](https://github.com/hashgraph-online/awesome-codex-plugins) → `plugins/LVTD-LLC/skills/skills/javascript-ui-math/SKILL.md`
