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_Ternary.md

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+---
+id: javascript-ternary
+title: "JavaScript Ternary"
+category: "Frontend"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["ternary operator", "conditional operator", "JS ternary", "?: operator", "shorthand if else"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.9
+created_at: 2026-06-23
+updated_at: 2026-06-23
+review_reason: ""
+merge_history: []
+tags: ["javascript", "js", "web", "frontend", "w3schools", "ternary", "operators", "conditional"]
+raw_sources: ["https://www.w3schools.com/js/js_if_ternary.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[JavaScript Ternary]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+The conditional (ternary) operator is a shorthand for an `if...else` statement — it is the only JavaScript operator that takes three operands. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Shorthand for `if...else`** — the conditional operator is a shorthand for writing conditional `if...else` statements. [S1]
+- **Three operands** — it is called a ternary operator because it takes three operands, and it is the only JavaScript operator that takes three operands. [S1]
+- **Returns one of two values** — it evaluates a condition and returns `expression1` if the condition is `true`, otherwise `expression2`. [S1]
+- **Standardized early** — `() ? x : y` is an ES1 feature (JavaScript 1997) and is fully supported in all browsers. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Inline conditional assignment** — assign one of two values to a variable in a single expression based on a test, e.g. `let text = (age < 18) ? "Minor" : "Adult";`. [S1]
+- **Flag-driven value selection** — use a boolean flag as the condition to pick between two literal values (e.g. a discount rate). [S1]
+
+## 📖 세부 내용 (Details)
+**The conditional (ternary) operator** [S1]
+The conditional operator is a shorthand for writing conditional `if...else` statements. It is called a ternary operator because it takes three operands.
+
+**Syntax** [S1]
+```
+(condition) ? expression1 : expression2
+```
+
+**Assigning a value based on a condition** [S1]
+```javascript
+let text = (age < 18) ? "Minor" : "Adult";
+```
+
+**Flag-driven selection — true branch** [S1]
+```javascript
+let isMember = true;
+let discount = isMember ? 0.2 : 0;
+```
+
+**Flag-driven selection — false branch** [S1]
+```javascript
+let isMember = false;
+let discount = isMember ? 0.2 : 0;
+```
+
+**Parameters** [S1]
+
+| Parameter | Description |
+|-----------|-------------|
+| condition | Required. The condition to be tested. An expression that evaluates to `true` or `false`. |
+| ? | Required. The operator separating the condition from the expressions. |
+| expression1 | Required. The value to return if the condition is `true`. |
+| : | Required. The operator separating the expressions. |
+| expression2 | Required. The value to return if the condition is `false`. |
+
+**Note** [S1]
+The conditional (ternary) operator is the only JavaScript operator that takes three operands.
+
+**Browser support** [S1]
+`() ? x : y` is an ES1 feature (JavaScript 1997). It is fully supported in all browsers.
+
+## 🛠️ 적용 사례 (Applied in summary)
+The page's own snippets are the canonical applied examples — selecting between `"Minor"`/`"Adult"` based on `age`, and choosing a `discount` based on an `isMember` flag. No external project/commit applications found in the source.
+
+## 💻 코드 패턴 (Code patterns)
+Inline conditional assignment:
+```javascript
+let text = (age < 18) ? "Minor" : "Adult";
+```
+Flag-driven value selection:
+```javascript
+let isMember = true;
+let discount = isMember ? 0.2 : 0;
+```
+
+## ⚖️ 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:** 0.90
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[JavaScript Tutorial]]
+- **관련 개념:** [[JavaScript If Else]], [[JavaScript Switch]], [[JavaScript Comparisons]], [[JavaScript Booleans]]
+- **참조 맥락:** Used wherever a compact `if...else` value selection is needed inline within an expression.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — JavaScript Ternary — https://www.w3schools.com/js/js_if_ternary.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-06-23: Initial draft synthesized from the W3Schools "JavaScript Ternary" page (Astra wiki-curation, P-Reinforce v3.1 format).