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10_Wiki/Dev/Topic_JavaScript/JavaScript_Class_Static.md

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