docs(10_Wiki): W3Schools 위키화 — HTML/CSS/JavaScript(core)

W3Schools 튜토리얼을 P-Reinforce v3.1 포맷으로 위키화(영어 본문, 한/영 섹션 헤더).
- Topic_HTML: 59문서 (튜토리얼+예제, 레퍼런스/메타 제외)
- Topic_CSS: 190문서 (메인 + Advanced/Flexbox/Grid/RWD 전체)
- Topic_JavaScript: 120문서 (코어 언어; Temporal/DOM상세/BOM/WebAPI/AJAX/jQuery/Graphics 등은 후속)
각 폴더 00_INDEX.md(MOC) 포함. 코드 verbatim, 미확인분은 "Not found in source" 표기.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

10_Wiki/Topic_JavaScript/JavaScript_Control_Flow.md

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+---
+id: javascript-control-flow
+title: "JavaScript Control Flow"
+category: "Frontend"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["control flow", "program flow", "execution order", "JS control flow", "conditional flow"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.88
+created_at: 2026-06-23
+updated_at: 2026-06-23
+review_reason: ""
+merge_history: []
+tags: ["javascript", "js", "web", "frontend", "w3schools", "control-flow", "loops", "conditions"]
+raw_sources: ["https://www.w3schools.com/js/js_control_flow.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[JavaScript Control Flow]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+Control flow is the order in which statements are executed; by default JavaScript runs top-to-bottom and left-to-right on a single thread, and conditions, loops, jumps, and functions are how you alter that order. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Control flow = order of execution** — control flow is the order in which statements are executed in a program. [S1]
+- **Default flow is sequential** — by default JavaScript executes code sequentially from top to bottom and left to right. [S1]
+- **Conditional flow** — conditions allow decision-making using `if`, `if...else`, `switch`, and the ternary (`? :`) operators. [S1]
+- **Loops repeat code** — loops enable code to run multiple times using `for`, `while`, or `do...while` structures. [S1]
+- **Jump statements alter flow abruptly** — using `break`, `continue`, `return`, and `throw`. [S1]
+- **Functions are callable, reusable blocks** — functions run when they are called. [S1]
+- **Single-threaded** — JavaScript runs on a single thread; it can only do one thing at a time, so every task waits for the completion of previous tasks. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Branch on a condition** — assign a default value, then override it inside `if/else` based on a test (e.g. `age >= 18`). [S1]
+- **Repeat with a counted loop** — drive repetition with a `for` loop counter and accumulate output. [S1]
+- **Early exit from a loop** — combine a loop with a `break` inside an `if` to stop early. [S1]
+- **Encapsulate logic in a function** — wrap reusable computation in a function that returns a value. [S1]
+
+## 📖 세부 내용 (Details)
+**JavaScript Control Flow**
+Control flow is the order in which statements are executed in a program. By default, JavaScript executes code sequentially from top to bottom and left to right. Control flow statements enable developers to alter this sequence based on conditions, loops, or keywords. [S1]
+
+**Default Flow**
+Default flow runs code sequentially from top to bottom and left to right. [S1]
+```javascript
+let x = 5;
+let y = 6;
+let z = x + y;
+```
+
+**Conditional Control Flow**
+Conditions allow decision-making using `if`, `if...else`, `switch`, and ternary (`? :`) operators. [S1]
+```javascript
+let text = "Unknown";
+
+if (age >= 18) {
+  text = "Adult";
+} else {
+  text = "Minor";
+}
+```
+
+**Loops (Repetition Control Flow)**
+Loops enable code to run multiple times using `for`, `while`, or `do...while` structures. [S1]
+```javascript
+for (let i = 0; i < 5; i++) {
+  text += "The number is " + i + "<br>";
+}
+```
+
+**Jump Statements**
+Jump statements alter flow abruptly using `break`, `continue`, `return`, and `throw`. [S1]
+```javascript
+for (let i = 0; i < 10; i++) {
+  if (i === 3) { break; }
+  text += "The number is " + i + "<br>";
+}
+```
+
+**Function Flow**
+Functions are callable and reusable code blocks. Functions will run when they are called. [S1]
+```javascript
+function myFunction(p1, p2) {
+  return p1 * p2;
+}
+```
+
+**JavaScript Is Single-Threaded**
+JavaScript runs on a single thread. It can only do one thing at a time. Every task must wait for completion of previous tasks, potentially freezing applications during slow operations. Asynchronous programming is covered in the advanced section. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+The page's own snippets are the canonical applied examples — sequential assignment, an `if/else` age check, a counted `for` loop, an early `break`, and a multiplying function. No external project/commit applications found in the source.
+
+## 💻 코드 패턴 (Code patterns)
+Conditional branch:
+```javascript
+if (age >= 18) {
+  text = "Adult";
+} else {
+  text = "Minor";
+}
+```
+Counted loop with early exit:
+```javascript
+for (let i = 0; i < 10; i++) {
+  if (i === 3) { break; }
+  text += "The number is " + i + "<br>";
+}
+```
+Reusable function:
+```javascript
+function myFunction(p1, p2) {
+  return p1 * p2;
+}
+```
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+No contradictions found in the source.
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual (실제 적용 사례 발견 시 applied/validated로 승격 가능)
+- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
+- **신뢰 점수:** 0.88
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[JavaScript Tutorial]]
+- **관련 개념:** [[JavaScript If Else]], [[JavaScript Switch]], [[JavaScript For Loop]], [[JavaScript Break]], [[JavaScript Continue]], [[JavaScript Functions]]
+- **참조 맥락:** The conceptual umbrella for every statement that changes execution order in a JavaScript program.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — JavaScript Control Flow — https://www.w3schools.com/js/js_control_flow.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-06-23: Initial draft synthesized from the W3Schools "JavaScript Control Flow" page (Astra wiki-curation, P-Reinforce v3.1 format).