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_Error_Object.md

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+---
+id: javascript-error-object
+title: "JavaScript Error Object"
+category: "Frontend"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["Error object", "error reference", "err.name", "err.message", "error names"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.87
+created_at: 2026-06-23
+updated_at: 2026-06-23
+review_reason: ""
+merge_history: []
+tags: ["javascript", "js", "web", "frontend", "w3schools", "errors", "error-object"]
+raw_sources: ["https://www.w3schools.com/js/js_error_object.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[JavaScript Error Object]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+JavaScript's built-in Error object carries information when an error occurs, exposing useful properties such as `name` and `message`, with `name` returning one of six standard error types. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **The Error object** is built in and provides information when errors occur, with useful properties like `name` and `message`. [S1]
+- **`Error.isError(x)`** returns true if a value is an Error. [S1]
+- **Six error names** — the `name` property can return `EvalError`, `RangeError`, `ReferenceError`, `SyntaxError`, `TypeError`, or `URIError`. [S1]
+- **EvalError is deprecated** — use `SyntaxError` instead. [S1]
+- **Avoid non-standard members** — several properties and methods are browser-specific or outdated and should not be used. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Read `name` to branch on error type** — the standardized set of six error names lets handling code distinguish what went wrong. [S1]
+- **Stick to standard members** — rely on `name`, `message`, and `cause`; avoid deprecated/non-standard properties and methods. [S1]
+
+## 📖 세부 내용 (Details)
+**The Error Object**
+JavaScript includes a built-in error object providing information when errors occur, with useful properties like `name` and `message`. [S1]
+
+**Error Object Methods & Properties** [S1]
+
+| Property / Method | Description |
+|-------------------|-------------|
+| `new Error()` | Creates a new Error object |
+| `name` | Sets or returns an error name |
+| `message` | Sets or returns an error message |
+| `cause` | Sets or returns an error cause |
+| `Error.isError(x)` | Returns true if a value (x) is an Error |
+
+**Error Names**
+The `name` property can return one of six error types: [S1]
+
+| Error Name | Description |
+|------------|-------------|
+| `EvalError` | Deprecated - use SyntaxError instead |
+| `RangeError` | A number "out of range" has occurred |
+| `ReferenceError` | An illegal reference has occurred |
+| `SyntaxError` | A syntax error has occurred |
+| `TypeError` | A type error has occurred |
+| `URIError` | An error in encodeURI() has occurred |
+
+Each error name has an associated "Try it" button linking to examples. No inline code examples are displayed on this reference page. [S1]
+
+**Non-Standard Properties and Methods**
+The page warns against using deprecated, browser-specific, or outdated members: [S1]
+- **Properties:** `arguments`, `caller`, `columnNumber`, `description`, `displayName`, `fileName`, `lineNumber`, `number`, `stack`
+- **Methods:** `evalError()`, `internalError()`, `toSource()`
+
+## 🛠️ 적용 사례 (Applied in summary)
+This is a reference page; the source displays no inline code examples (only "Try it" links). The applicable usage is reading `err.name` / `err.message` inside a `catch` block, as shown on the related Error Statements page. No external project/commit applications found in the source.
+
+## 💻 코드 패턴 (Code patterns)
+Not found in source as displayed inline code; the reference page exposes only the property/method and error-name tables above and links to external "Try it" examples. The canonical access pattern (drawn from the same family of pages) is reading the standard properties:
+```javascript
+try {
+  // ...
+} catch(err) {
+  let name = err.name;       // e.g. "TypeError"
+  let message = err.message; // human-readable description
+}
+```
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+- **EvalError deprecation** — the source marks `EvalError` as deprecated in favor of `SyntaxError`. [S1]
+- **Non-standard members** — listed properties/methods are flagged as browser-specific or outdated and should be avoided. [S1]
+
+## ✅ 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:** 0.87
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[JavaScript Tutorial]]
+- **관련 개념:** [[JavaScript Errors Intro]], [[JavaScript Error Statements]], [[JavaScript Silent Errors]], [[JavaScript Debugging]]
+- **참조 맥락:** The reference for the object received in a `catch` block and the standardized error names used to identify failures.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — JavaScript Error Object — https://www.w3schools.com/js/js_error_object.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-06-23: Initial draft synthesized from the W3Schools "JavaScript Error Object" page (Astra wiki-curation, P-Reinforce v3.1 format).