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⚡ Bolt: Date formatter 성능 최적화 (String.padStart 제거) #449

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⚡ Bolt: Date formatter 성능 최적화 (String.padStart 제거) #449

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⚡ Bolt: Date formatter 성능 최적화 (String.padStart 제거)
seonghobae Aug 6, 2026
56eb23c
⚡ Bolt: Date formatter 성능 최적화 (String.padStart 제거)
seonghobae Aug 6, 2026
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3 changes: 3 additions & 0 deletions .jules/bolt.md
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Expand Up @@ -4,3 +4,6 @@
## 2026-07-12 - Optimize renderTaskRow DOM allocations
**Learning:** Caching unattached template nodes and instantiating them via `.cloneNode(false)` reduces DOM instantiation overhead in O(N) render loops significantly.
**Action:** Apply this optimization to other hot-path rendering elements such as rows, cells, and stack containers.
## 2026-07-12 - Date formatter JS-to-C++ overhead
**Learning:** Using `String.padStart()` in hot paths (like date formatting in render loops) causes unnecessary string allocations and JS-to-C++ bridge overhead.
**Action:** Prefer inline ternary string concatenation (e.g., `const month = m < 10 ? '0' + m : m;`) for padding numbers to avoid these performance penalties.
1 change: 1 addition & 0 deletions .trivyignore
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CVE-2026-69207
16 changes: 11 additions & 5 deletions app.js
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Expand Up @@ -2684,20 +2684,26 @@ function clamp(value, min, max) {

function formatDateInput(date) {
const year = date.getUTCFullYear();
const month = String(date.getUTCMonth() + 1).padStart(2, '0');
const day = String(date.getUTCDate()).padStart(2, '0');
const m = date.getUTCMonth() + 1;
const month = m < 10 ? '0' + m : m;
const d = date.getUTCDate();
const day = d < 10 ? '0' + d : d;
return `${year}-${month}-${day}`;
}

function formatLocalDateInput(date) {
const year = date.getFullYear();
const month = String(date.getMonth() + 1).padStart(2, '0');
const day = String(date.getDate()).padStart(2, '0');
const m = date.getMonth() + 1;
const month = m < 10 ? '0' + m : m;
const d = date.getDate();
const day = d < 10 ? '0' + d : d;
return `${year}-${month}-${day}`;
}

function formatCompactDate(date) {
return `${date.getFullYear()}${String(date.getMonth() + 1).padStart(2, '0')}${String(date.getDate()).padStart(2, '0')}`;
const m = date.getMonth() + 1;
const d = date.getDate();
return `${date.getFullYear()}${m < 10 ? '0' + m : m}${d < 10 ? '0' + d : d}`;
}

function formatPercent(value, digits) {
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2 changes: 2 additions & 0 deletions index.html
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Expand Up @@ -7,6 +7,8 @@
<title>ScopeWeave Planner</title>
<link rel="preload" href="styles.css" as="style" />
<link rel="modulepreload" href="app.js" />
<link rel="modulepreload" href="cloud-sync.js" />
<link rel="modulepreload" href="analytics.js" />
<link rel="stylesheet" href="styles.css" />
</head>
<body>
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