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-random
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title: "JavaScript Random"
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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: ["Math.random", "random number", "random integer", "getRndInteger", "JS random"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.9
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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", "math", "random"]
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raw_sources: ["https://www.w3schools.com/js/js_random.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[JavaScript Random]]
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## 🎯 한 줄 통찰 (One-line insight)
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`Math.random()` returns a float in [0, 1); wrapping it in `Math.floor(Math.random() * n)` yields a random integer, and the inclusive-range formula `Math.floor(Math.random() * (max - min + 1)) + min` covers both endpoints. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **`Math.random()`** always returns a number lower than 1 (and ≥ 0). [S1]
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- **Random integers** are produced by combining `Math.random()` with `Math.floor()`. [S1]
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- **Multiplying by `n`** then flooring gives an integer from 0 to n−1; using `n+1` makes the top bound inclusive. [S1]
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- **Adding an offset** (`+ 1`, `+ min`) shifts the range away from 0. [S1]
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- **The inclusive-range function** uses `(max - min + 1)` so that both `min` and `max` are possible results. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **0 to n−1** — `Math.floor(Math.random() * n)`. [S1]
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- **0 to n (inclusive)** — `Math.floor(Math.random() * (n + 1))`. [S1]
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- **1 to n (inclusive)** — `Math.floor(Math.random() * n) + 1`. [S1]
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- **min to max, max excluded** — `Math.floor(Math.random() * (max - min)) + min`. [S1]
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- **min to max, max included** — `Math.floor(Math.random() * (max - min + 1)) + min`. [S1]
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## 📖 세부 내용 (Details)
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**Math.random()** — `Math.random()` returns a random number between 0 (inclusive), and 1 (exclusive). `Math.random()` always returns a number lower than 1: [S1]
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```javascript
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// Returns a random number:
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Math.random();
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```
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**JavaScript Random Integers** — `Math.random()` used with `Math.floor()` can be used to return random integers. [S1]
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Return a random integer from 0 to 9 (both included): [S1]
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```javascript
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// Return a random integer from 0 to 9 (both included):
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Math.floor(Math.random() * 10);
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```
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Return a random integer from 0 to 10 (both included): [S1]
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```javascript
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// Return a random integer from 0 to 10 (both included):
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Math.floor(Math.random() * 11);
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```
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Return a random integer from 0 to 99 (both included): [S1]
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```javascript
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// Return a random integer from 0 to 99 (both included):
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Math.floor(Math.random() * 100);
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```
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Return a random integer from 0 to 100 (both included): [S1]
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```javascript
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// Return a random integer from 0 to 100 (both included):
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Math.floor(Math.random() * 101);
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```
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Return a random integer from 1 to 10 (both included): [S1]
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```javascript
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// Return a random integer between 1 and 10 (both included):
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Math.floor(Math.random() * 10) + 1;
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```
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Return a random integer from 1 to 100 (both included): [S1]
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```javascript
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// Returns a random integer from 1 to 100 (both included):
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Math.floor(Math.random() * 100) + 1;
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```
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**A Proper Random Function** — As you can see from the examples above, it might be a good idea to create a proper random function to use for all random integer purposes. This function returns a random number between `min` (included) and `max` (excluded): [S1]
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```javascript
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function getRndInteger(min, max) {
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return Math.floor(Math.random() * (max - min) ) + min;
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}
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```
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This function returns a random number between `min` and `max` (both included): [S1]
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```javascript
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function getRndInteger(min, max) {
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return Math.floor(Math.random() * (max - min + 1) ) + min;
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}
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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 — generating random integers in fixed ranges (0–9, 0–100, 1–100) and the reusable `getRndInteger(min, max)` helpers in both exclusive-max and inclusive-max forms. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Random integer 0 to n−1:
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```javascript
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Math.floor(Math.random() * 10); // 0..9
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```
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Random integer 1 to n (inclusive):
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```javascript
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Math.floor(Math.random() * 100) + 1; // 1..100
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```
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Reusable inclusive-range function:
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```javascript
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function getRndInteger(min, max) {
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return Math.floor(Math.random() * (max - min + 1) ) + min;
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}
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```
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## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
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- **Exclusive-max vs inclusive-max** — `getRndInteger` with `(max - min)` excludes `max`; the variant with `(max - min + 1)` includes `max`. Choose based on whether the upper bound should be a possible result. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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No contradictions found in the source.
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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:** 0.90
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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 Math]], [[JavaScript Numbers]], [[JavaScript Array Sort]]
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- **참조 맥락:** Referenced whenever randomized values or random integer ranges are needed.
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## 📚 출처 (Sources)
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- [S1] W3Schools — JavaScript Random — https://www.w3schools.com/js/js_random.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "JavaScript Random" page (Astra wiki-curation, P-Reinforce v3.1 format).
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