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-const
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title: "JavaScript Const"
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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: ["const keyword", "constant reference", "constant objects", "constant arrays", "const hoisting"]
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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", "const", "block-scope"]
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raw_sources: ["https://www.w3schools.com/js/js_const.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[JavaScript Const]]
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## 🎯 한 줄 통찰 (One-line insight)
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`const` (ES6, 2015) declares a block-scoped constant reference that cannot be reassigned or redeclared — but for objects and arrays it only fixes the reference, so their contents can still be changed. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Cannot be reassigned** — a variable declared with `const` cannot be reassigned. [S1]
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- **Must be assigned at declaration** — `const` variables must be assigned a value when they are declared. [S1]
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- **Constant reference, not constant value** — `const` defines a constant reference to a value; it does not make the value itself immutable. [S1]
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- **Objects/arrays are mutable** — you cannot reassign a `const` array or object, but you can change array elements and object properties. [S1]
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- **Block scope** — `const` (like `let`) has block scope. [S1]
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- **Hoisted but not initialized** — `const` is hoisted but not initialized; using it before declaration causes a `ReferenceError`. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **const-by-default** — declare with `const` whenever the value should not change; reserve `let` for the cases where it must. [S1]
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- **Mutate-not-reassign** — for collections, modify elements/properties in place rather than rebinding the variable. [S1]
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- **Declare-with-value** — `const` cannot be split into a bare declaration plus a later assignment; assign at the point of declaration. [S1]
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## 📖 세부 내용 (Details)
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**Cannot be Reassigned** — A variable declared with `const` cannot be reassigned: [S1]
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```javascript
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const PI = 3.141592653589793;
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PI = 3.14; // This will give an error
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PI = PI + 10; // This will also give an error
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```
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**Must be Assigned** — JavaScript `const` variables must be assigned a value when they are declared. Correct: [S1]
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```javascript
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const PI = 3.14159265359;
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```
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Incorrect: [S1]
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```javascript
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const PI;
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PI = 3.14159265359;
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```
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**When to use JavaScript const?** — Always declare a variable with `const` when you know that the value should not be changed. Use `const` when you declare: a new Array, a new Object, a new Function, or a new RegExp. [S1]
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**Constant Objects and Arrays** — The keyword `const` is a little misleading. It does not define a constant value; it defines a constant reference to a value. Because of this you can NOT reassign a constant value, array, or object, but you CAN change the elements of a constant array and change the properties of a constant object. [S1]
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**Constant Arrays** — You can change the elements of a constant array: [S1]
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```javascript
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// You can create a constant array:
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const cars = ["Saab", "Volvo", "BMW"];
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// You can change an element:
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cars[0] = "Toyota";
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// You can add an element:
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cars.push("Audi");
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```
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But you can NOT reassign the array: [S1]
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```javascript
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const cars = ["Saab", "Volvo", "BMW"];
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cars = ["Toyota", "Volvo", "Audi"]; // ERROR
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```
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**Constant Objects** — You can change the properties of a constant object: [S1]
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```javascript
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// You can create a const object:
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const car = {type:"Fiat", model:"500", color:"white"};
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// You can change a property:
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car.color = "red";
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// You can add a property:
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car.owner = "Johnson";
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```
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But you can NOT reassign the object: [S1]
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```javascript
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const car = {type:"Fiat", model:"500", color:"white"};
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car = {type:"Volvo", model:"EX60", color:"red"} // ERROR
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```
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**Block Scope** — Declaring a variable with `const` is similar to `let` regarding Block Scope. The `x` declared in the block is not the same as the `x` declared outside the block: [S1]
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```javascript
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const x = 10;
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// Here x is 10
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{
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const x = 2;
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// Here x is 2
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}
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// Here x is 10
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```
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**Redeclaring** — Redeclaring an existing `var` or `let` variable to `const`, in the same scope, is not allowed: [S1]
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```javascript
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var x = 2; // Allowed
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const x = 2; // Not allowed
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{
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let x = 2; // Allowed
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const x = 2; // Not allowed
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}
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```
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Reassigning or redeclaring an existing `const`, in the same scope, is not allowed: [S1]
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```javascript
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const x = 2; // Allowed
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x = 2; // Not allowed
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var x = 2; // Not allowed
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let x = 2; // Not allowed
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const x = 2; // Not allowed
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```
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Redeclaring a `const`, in another scope or in another block, is allowed: [S1]
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```javascript
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const x = 2; // Allowed
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{
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const x = 3; // Allowed
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}
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{
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const x = 4; // Allowed
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}
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```
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**Hoisting** — Variables defined with `const` are hoisted to the top, but not initialized. Using a `const` variable before it is declared results in a `ReferenceError`: [S1]
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```javascript
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alert (carName);
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const carName = "Volvo";
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```
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## 🛠️ 적용 사례 (Applied in summary)
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The page's own snippets are the canonical applied examples — the reassignment errors on `PI`, mutating vs reassigning a `const` array and object, block-scoped `const x`, the redeclaration rules, and the hoisting `ReferenceError`. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Constant reference:
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```javascript
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const PI = 3.141592653589793;
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```
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Mutate a const collection without reassigning:
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```javascript
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const cars = ["Saab", "Volvo", "BMW"];
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cars[0] = "Toyota";
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cars.push("Audi");
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```
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## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
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The source compares the three declaration keywords: [S1]
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| Feature | var | let | const |
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|---------|-----|-----|-------|
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| Scope | Function or global scope | Block-scope `{ }` | Block-scope `{ }` |
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| Reassignment | Can be updated | Can be updated | Cannot be updated |
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| Redeclaration | Can be redeclared | Cannot be redeclared | Cannot be redeclared |
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| Hoisting | Initialized as `undefined` | Hoisted, not initialized | Hoisted, not initialized |
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Choose `const` whenever the binding should never be reassigned (the default for Arrays, Objects, Functions, RegExp); use `let` only when reassignment is required; avoid `var`. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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No contradictions found in the source. The source highlights that "const" is itself a little misleading — it fixes the reference, not the value — which is a clarification rather than a contradiction.
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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 Variables]], [[JavaScript Let]], [[JavaScript Statements]]
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- **참조 맥락:** The immutable-binding declaration keyword, the recommended default, paired with `let`.
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## 📚 출처 (Sources)
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- [S1] W3Schools — JavaScript Const — https://www.w3schools.com/js/js_const.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "JavaScript Const" page (Astra wiki-curation, P-Reinforce v3.1 format).
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