diff --git a/.jules/bolt.md b/.jules/bolt.md
index b08b203a..bcc88a91 100644
--- a/.jules/bolt.md
+++ b/.jules/bolt.md
@@ -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 - 핫루프 내 날짜 포맷 최적화 (String.padStart 회피)
+**Learning:** `String.prototype.padStart()` 메서드는 편리하지만 핫루프(예: 날짜 포맷팅) 내에서 호출될 때 불필요한 문자열 객체 할당 오버헤드를 발생시켜 성능을 저하시킵니다. 특히 대량의 WBS 데이터를 렌더링하거나 처리할 때 이러한 오버헤드는 누적됩니다.
+**Action:** 성능에 민감한 핫루프 내에서 단순한 패딩 처리가 필요한 경우, 항상 인라인 삼항 연산자 기반의 문자열 연결(예: `m < 10 ? '0' + m : m`)을 사용하여 할당 비용과 함수 호출 오버헤드를 줄이세요.
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e434fa01..e96b8bec 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -91,6 +91,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
script, and requirements copies.
- Documented Kubernetes/IaC as follow-up work rather than a current
blocker for this static app.
+- ⚡ Bolt: 날짜 포맷팅 함수(`formatDateInput`, `formatLocalDateInput`, `formatCompactDate`)에서 `String.prototype.padStart()` 호출을 인라인 삼항 연산자로 대체하여 메모리 할당을 최적화하고 핫루프 성능을 개선했습니다.
## [1.0.0] - 2026-04-20
diff --git a/app.js b/app.js
index a04aae71..ee388e33 100644
--- a/app.js
+++ b/app.js
@@ -2684,20 +2684,28 @@ 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 d = date.getUTCDate();
+ // ⚡ Bolt: Inline ternary avoids String.padStart() allocation overhead in hot loops.
+ const month = m < 10 ? '0' + m : m;
+ const day = d < 10 ? '0' + d : d;
return `${year}-${month}-${day}`;
}
function formatLocalDateInput(date) {
const year = date.getFullYear();
- const month = String(date.getMonth() + 1).padStart(2, '0');
- const day = String(date.getDate()).padStart(2, '0');
+ const m = date.getMonth() + 1;
+ const d = date.getDate();
+ // ⚡ Bolt: Inline ternary string concatenation is faster than String.padStart().
+ const month = m < 10 ? '0' + m : m;
+ const day = d < 10 ? '0' + d : d;
return `${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) {
diff --git a/index.html b/index.html
index d24b2a88..879ad03b 100644
--- a/index.html
+++ b/index.html
@@ -7,6 +7,8 @@
ScopeWeave Planner
+
+