docs(10_Wiki): Dev 폴더 누락분 반영 — Topic_Programming으로 통합
이전 재구성 작업에서 Dev/ 폴더가 누락되었던 것을 반영. - Dev/Topic_Programming(중첩 폴더, 78개)은 Dev 자체 최상위 폴더들 (Architecture/Conventions/Engineering_Intelligence 등)과 완전 중복이라 제거. - Dev 최상위 엔지니어링 지식 폴더(Architecture/Conventions/Engineering_Intelligence/ Failure_Library/Generalized_Principles/Language/Pattern_Catalog/Platform_Guides/ Subsystems, 77개)는 이미 Topic_Programming/Topic_Programming에 더 최신 버전이 존재해 중복 제거(고유 콘텐츠 1개는 예외 처리하여 이동 보존). - Dev의 W3Schools 언어 튜토리얼 폴더(Topic_C/CPP/CSS/CSharp/HOWTO/HTML/Java/ JavaScript/PHP/Python/SQL/W3CSS, 1201개)는 전부 Topic_Programming 하위로 이동. - 에이전트 운영 상태(.astra/docs)는 그대로 유지, 콘텐츠 폴더만 정리. - Topic_Programming 최종 문서 수: 2784 → 3985.
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Antigravity Agent
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---
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id: javascript-operators
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title: "JavaScript Operators"
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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 operators", "JavaScript operator types", "arithmetic operators", "assignment operators", "comparison operators", "logical operators", "concatenation operator"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.88
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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", "operators"]
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raw_sources: ["https://www.w3schools.com/js/js_operators.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[JavaScript Operators]]
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## 🎯 한 줄 통찰 (One-line insight)
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JavaScript operators are used for mathematical and logical computations — the `=` assigns, `+` adds (and concatenates strings), `*` multiplies, and comparison/logical operators evaluate conditions. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Operators are for mathematical and logical computations** — they perform operations on values and variables. [S1]
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- **Four core single examples** — the assignment operator `=` assigns values, the addition operator `+` adds, the multiplication operator `*` multiplies, and the comparison operator `>` compares. [S1]
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- **Operator categories** — JavaScript operators include Arithmetic, Assignment, Comparison, Logical, and String operators. [S1]
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- **`+` is overloaded** — when used on strings, the `+` operator is called the concatenation operator; if you add a number and a string, the result is a string. [S1]
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- **Comparisons return booleans** — comparison operators always return `true` or `false`, and strings are compared alphabetically. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Compute into a new variable** — combine two operands with an arithmetic operator and store the result: `let z = x + y;`. [S1]
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- **Compound assignment** — `x += 5` is shorthand for `x = x + 5`. [S1]
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- **Concatenate then assign** — build a string with `+` and a separator: `text1 + " " + text2`. [S1]
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## 📖 세부 내용 (Details)
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**Operators are for Mathematical and Logical Computations** [S1]
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The assignment operator (`=`) assigns a value to a variable:
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```javascript
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let x = 10;
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```
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The addition operator (`+`) adds values:
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```javascript
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let x = 5;
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let y = 2;
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let z = x + y;
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```
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The multiplication operator (`*`) multiplies values:
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```javascript
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let x = 5;
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let y = 2;
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let z = x * y;
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```
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A more complex expression mixing addition and multiplication: [S1]
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```javascript
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let a = 3;
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let x = (100 + 50) * a;
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```
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**Types of JavaScript Operators** [S1]
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There are different types of JavaScript operators: Arithmetic, Assignment, Comparison, String, Logical, and others.
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**JavaScript Arithmetic Operators** [S1]
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Arithmetic operators are used to perform arithmetic on numbers:
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| Operator | Description |
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|----------|-------------|
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| + | Addition |
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| - | Subtraction |
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| * | Multiplication |
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| ** | Exponentiation |
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| / | Division |
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| % | Modulus (Division Remainder) |
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| ++ | Increment |
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| -- | Decrement |
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**JavaScript String Addition** [S1]
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When used on strings, the `+` operator is called the concatenation operator:
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```javascript
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let text1 = "John";
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let text2 = "Doe";
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let text3 = text1 + " " + text2;
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```
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The `+=` assignment operator can also concatenate:
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```javascript
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let text1 = "What a very ";
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text1 += "nice day";
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```
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**Adding Strings and Numbers** [S1]
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If you add a number and a string, the result will be a string:
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```javascript
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let x = 5 + 5;
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let y = "5" + 5;
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let z = "Hello" + 5;
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```
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**JavaScript Assignment Operators** [S1]
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Assignment operators assign values to JavaScript variables. For example, `x += 5` is the same as `x = x + 5`:
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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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| Operator | Example | Same As |
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|----------|---------|---------|
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| = | x = y | x = y |
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| += | x += y | x = x + y |
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| -= | x -= y | x = x - y |
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| *= | x *= y | x = x * y |
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| /= | x /= y | x = x / y |
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| %= | x %= y | x = x % y |
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| **= | x **= y | x = x ** y |
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**JavaScript Comparison Operators** [S1]
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Comparison operators always return `true` or `false`:
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```javascript
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let x = 5;
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let result = x > 8;
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```
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| Operator | Description | Example |
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|----------|-------------|---------|
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| == | equal to | x == 5 |
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| === | equal value and equal type | x === 5 |
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| != | not equal | x != 5 |
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| !== | not equal value or not equal type | x !== 5 |
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| > | greater than | x > 5 |
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| < | less than | x < 5 |
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| >= | greater than or equal to | x >= 5 |
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| <= | less than or equal to | x <= 5 |
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Strings are compared alphabetically: [S1]
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```javascript
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let text1 = "A";
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let text2 = "B";
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let result = text1 < text2;
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```
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**JavaScript Logical Operators** [S1]
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| Operator | Description |
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|----------|-------------|
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| && | logical and |
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| \|\| | logical or |
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| ! | logical not |
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## 🛠️ 적용 사례 (Applied in summary)
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The page's own snippets are the canonical applied examples — assigning with `=`, computing with `+`/`*`, concatenating strings, compound-assigning with `+=`, and comparing values/strings. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Compute and store a result:
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```javascript
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let x = 5;
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let y = 2;
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let z = x + y;
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```
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Concatenate strings with a separator:
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```javascript
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let text3 = text1 + " " + text2;
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```
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Compound 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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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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No contradictions found in the source. The behavior that `"5" + 5` yields a string (`"55"`) rather than `10` is intentional, not a contradiction — `+` concatenates when a string operand is present.
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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:** 0.88
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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 Arithmetic]], [[JavaScript Assignment]], [[JavaScript Comparisons]], [[JavaScript Types]]
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- **참조 맥락:** The umbrella reference for the operator-family pages (arithmetic, assignment, comparison, logical) that follow it.
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## 📚 출처 (Sources)
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- [S1] W3Schools — JavaScript Operators — https://www.w3schools.com/js/js_operators.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "JavaScript Operators" page (Astra wiki-curation, P-Reinforce v3.1 format).
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