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Get Started Free →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.
.claude/skills/hashgraph-online-javascript-ui-math/SKILL.md| Test case | Without → With | Effect | Δ tokens | Δ turns |
|---|---|---|---|---|
| case-20 | ✗→✓ | ▲ Improved | 7% | 0% |
| case-18 | ✓→✓ | ＝ Same ✓ | 61% | 0% |
| case-01 | ✓→✓ | ＝ Same ✓ | 13% | 0% |
| case-02 | ✓→✓ | ＝ Same ✓ | -7% | 0% |
| case-03 | ✓→✓ | ＝ Same ✓ | 26% | 0% |
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.
guidelines.md to select the smallest relevant file set.references/ui-numbers/rules.md for implementation decisions.references/ui-numbers/examples.md when editing code.workflows/debug-ui-number-logic.md for multi-step derivation or debugging.| 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 |
Derived from Math for Web Design by Paul McFedries, Chapter 2: Math basics for JavaScript. Citations are tracked in references/source-map.md.
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