refactor(topics): 멀티 에이전트용 지식 재편 — _Common(공통 기본기) + Domain_* 구조
에이전트 8종(대화형/프로그래머 C·S/디자이너/설계자/기획자/QA/PD/PM)에게 [공통 기본 능력 + 롤별 Specialty] 2층으로 지식을 주입하기 위한 재분류. 문서 내용·포맷은 무수정, 폴더 이동만 (6,372개 문서 수 보존 확인). - Topic_Programming → Domain_Programming (내부 구조 보존) - Topic_Graphic → Domain_Design - Topic_Business → Domain_Product - Topic_General → Domain_General - _Common 신설: Math(구 Topic_Math_Specialty), Reasoning(구 General/From_Thinking & Reasoning), Reasoning_Creativity(구 General/From_창의성), Communication(Poetic_Blog_Writing + From_writing) - 타 도메인의 From_* 폴더는 유지 (출처 표기일 뿐, 이미 도메인에 맞게 분류된 문서) - 빈 폴더 정리 (memory/procedures) - 에이전트→폴더 매핑은 workspace의 .astra/agent-knowledge-map.json (9개 에이전트) Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Antigravity Agent
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---
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id: javascript-assignment
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title: "JavaScript Assignment"
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category: "Frontend"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["JS assignment operators", "compound assignment", "logical assignment", "falsy values", "truthy values", "nullish coalescing assignment", "spread operator"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.87
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created_at: 2026-06-23
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updated_at: 2026-06-23
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review_reason: ""
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merge_history: []
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tags: ["javascript", "js", "web", "frontend", "w3schools", "assignment", "operators"]
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raw_sources: ["https://www.w3schools.com/js/js_assignment.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[JavaScript Assignment]]
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## 🎯 한 줄 통찰 (One-line insight)
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Assignment operators assign values to variables — `=` for a plain assignment and compound forms (`+=`, `-=`, `*=`, `**=`, `/=`, `%=`) plus logical forms (`&&=`, `||=`, `??=`) for assign-and-operate in one step. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Assignment operators assign values** — they assign values to JavaScript variables. [S1]
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- **Compound assignment** — arithmetic compound operators combine an operation with assignment, e.g. `x += y` is the same as `x = x + y`. [S1]
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- **Logical assignment** — `&&=`, `||=`, and `??=` assign conditionally based on truthiness/falsiness/nullishness. [S1]
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- **8 falsy values** — `false`, `0`, `-0`, `0n`, `""` (empty strings), `null`, `undefined`, and `NaN` are falsy. [S1]
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- **Truthy surprises** — `"0"`, `"false"`, `[]`, and `{}` are truthy even though they look "empty". [S1]
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- **Spread `...`** — the `...` operator splits iterables into individual elements. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Mutate in place** — apply an operation to a variable and store back with one compound operator (`x += 5`). [S1]
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- **Conditional assignment** — `x ??= 10` assigns only when `x` is null/undefined; `x ||= 10` when falsy; `x &&= 10` when truthy. [S1]
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- **Falsy check awareness** — remember `"0"` and `"false"` strings (and `[]`/`{}`) are truthy when writing conditions. [S1]
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## 📖 세부 내용 (Details)
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**JavaScript Assignment Operators** [S1]
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Assignment operators assign values to JavaScript variables. Using `x = 10` and `y = 5` for the examples below, the result column shows the value after applying the operator:
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| Operator | Example | Same As | Result |
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|----------|---------|---------|--------|
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| = | x = y | x = y | x = 5 |
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| += | x += y | x = x + y | x = 15 |
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| -= | x -= y | x = x - y | x = 5 |
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| *= | x *= y | x = x * y | x = 50 |
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| **= | x **= y | x = x ** y | x = 100000 |
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| /= | x /= y | x = x / y | x = 2 |
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| %= | x %= y | x = x % y | x = 0 |
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**The = Operator** [S1]
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```javascript
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let x = 10;
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```
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**The += Operator** [S1]
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```javascript
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let x = 10;
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x += 5;
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```
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**The -= Operator** [S1]
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```javascript
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let x = 10;
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x -= 5;
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```
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**The *= Operator** [S1]
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```javascript
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let x = 10;
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x *= 5;
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```
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**The **= Operator** [S1]
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```javascript
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let x = 10;
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x **= 5;
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```
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**The /= Operator** [S1]
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```javascript
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let x = 10;
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x /= 5;
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```
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**The %= Operator** [S1]
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```javascript
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let x = 10;
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x %= 5;
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```
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**Logical Assignment Operators** [S1]
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The `&&=` Operator (Logical AND assignment):
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```javascript
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let x = true;
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let y = x &&= 10;
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```
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The `||=` Operator (Logical OR assignment):
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```javascript
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let x = false;
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let y = x ||= 10;
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```
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The `??=` Operator (Nullish Coalescing assignment):
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```javascript
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let x;
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x ??= 10;
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```
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**The 8 FALSY Values** [S1]
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The following values are falsy: `false`, `0`, `-0`, `0n`, `""` / `''` / `` (empty strings), `null`, `undefined`, and `NaN`.
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**These are TRUTHY** [S1]
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The following values are truthy: `"0"` (string), `"false"` (string), `[]` (empty array), and `{}` (empty object).
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**The Spread (...) Operator** [S1]
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The `...` operator splits iterables into individual elements.
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## 🛠️ 적용 사례 (Applied in summary)
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The page's own snippets are the canonical applied examples — each compound operator demonstrated against `let x = 10`, and the logical-assignment operators shown against boolean/undefined seeds. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Compound arithmetic assignment:
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```javascript
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let x = 10;
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x += 5;
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```
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Nullish-coalescing assignment (only assigns when null/undefined):
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```javascript
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let x;
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x ??= 10;
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```
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Logical OR assignment (assigns when falsy):
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```javascript
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let x = false;
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let y = x ||= 10;
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```
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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No contradictions found in the source. Worth noting: `"0"`, `"false"`, `[]`, and `{}` are truthy despite intuition, which the source explicitly flags.
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual (실제 적용 사례 발견 시 applied/validated로 승격 가능)
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.87
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[JavaScript Tutorial]]
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- **관련 개념:** [[JavaScript Operators]], [[JavaScript Arithmetic]], [[JavaScript Comparisons]], [[JavaScript Types]]
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- **참조 맥락:** Referenced whenever updating a variable's value or doing conditional/defaulting assignment.
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## 📚 출처 (Sources)
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- [S1] W3Schools — JavaScript Assignment — https://www.w3schools.com/js/js_assignment.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "JavaScript Assignment" page (Astra wiki-curation, P-Reinforce v3.1 format).
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