2nd/10_Wiki/Topic_Programming/Topic_JavaScript/JavaScript_Class_Static.md

id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit

id	title	category	status	verification_status	canonical_id	aliases	duplicate_of	source_trust_level	confidence_score	created_at	updated_at	review_reason	merge_history	tags	raw_sources	applied_in	github_commit
javascript-class-static	JavaScript Class Static	Frontend	draft	conceptual		static methods static keyword class-level method Car.hello static members		B	0.88	2026-06-23	2026-06-23			javascript js web frontend w3schools classes static oop	https://www.w3schools.com/js/js_class_static.asp

JavaScript Class Static

🎯 한 줄 통찰 (One-line insight)

Static methods are defined with the static keyword on the class itself and can only be called on the class, not on its objects — pass an object in as a parameter if a static method needs instance data. [S1]

🧠 핵심 개념 (Core concepts)

• Static methods live on the class — static class methods are defined on the class itself. [S1]
• Call on the class, not the object — you cannot call a static method on an object, only on an object class. [S1]
• Use a parameter for instance data — to use an object within a static method, send it as a parameter. [S1]

🧩 추출된 패턴 (Extracted patterns)

• static for class-level utilities — declare methods with static when they belong to the class rather than to any single instance. [S1]
• Inject the instance — when a static method needs object state, pass the object in (e.g. Car.hello(myCar)) since this will not be an instance. [S1]

📖 세부 내용 (Details)

Static Methods Static class methods are defined on the class itself. You cannot call a static method on an object, only on an object class: [S1]

class Car {
  constructor(name) {
    this.name = name;
  }
  static hello() {
    return "Hello!!";
  }
}

const myCar = new Car("Ford");

// You can call 'hello()' on the Car Class:
document.getElementById("demo").innerHTML = Car.hello();

// But NOT on a Car Object:
// document.getElementById("demo").innerHTML = myCar.hello();
// this will raise an error.

Passing an Object to a Static Method If you want to use an object inside a static method, you can send it as a parameter: [S1]

class Car {
  constructor(name) {
    this.name = name;
  }
  static hello(x) {
    return "Hello " + x.name;
  }
}
const myCar = new Car("Ford");
document.getElementById("demo").innerHTML = Car.hello(myCar);

🛠️ 적용 사례 (Applied in summary)

The Car.hello() examples are the canonical applied cases — one showing that the static method is callable only on the class, the other showing the object passed in as a parameter to access x.name. No external project/commit applications found in the source.

💻 코드 패턴 (Code patterns)

Declare and call a static method on the class (language: JavaScript):

class Car {
  constructor(name) { this.name = name; }
  static hello() { return "Hello!!"; }
}
Car.hello();        // ✅ on the class
// myCar.hello();   // ❌ on an object → error

Pass an instance into a static method:

static hello(x) { return "Hello " + x.name; }
Car.hello(myCar);

⚖️ 모순 및 업데이트 (Contradictions & updates)

No contradictions found in the source.

✅ 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: 0.88
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: JavaScript Tutorial
• 관련 개념: JavaScript Classes, JavaScript Class Inheritance, JavaScript Objects, JavaScript Object Methods
• 참조 맥락: Extends JavaScript Classes with class-level (static) methods and their call-site restriction.

📚 출처 (Sources)

• [S1] W3Schools — JavaScript Class Static — https://www.w3schools.com/js/js_class_static.asp

📝 변경 이력 (Change history)

• 2026-06-23: Initial draft synthesized from the W3Schools "JavaScript Class Static" page (Astra wiki-curation, P-Reinforce v3.1 format).