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10_Wiki/Dev/Topic_JavaScript/JavaScript_Object_Methods.md

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+---
+id: javascript-object-methods
+title: "JavaScript Object Methods"
+category: "Frontend"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["JS object methods", "object method", "this keyword", "method call parentheses", "fullName", "function as property"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.89
+created_at: 2026-06-23
+updated_at: 2026-06-23
+review_reason: ""
+merge_history: []
+tags: ["javascript", "js", "web", "frontend", "w3schools", "objects", "methods", "this"]
+raw_sources: ["https://www.w3schools.com/js/js_object_methods.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[JavaScript Object Methods]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+Methods are functions stored as object property values; call them with parentheses, and inside them `this` refers to the owning object. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Methods are actions on objects** — they are functions stored as property values. [S1]
+- **`this` is the object** — in an object method, `this` refers to the object that owns the method. [S1]
+- **Parentheses execute the method** — `person.fullName()` runs the function; `person.fullName` returns the function definition. [S1]
+- **Add methods by assignment** — assign a function to a property to add a method. [S1]
+- **Built-in methods compose** — a method can call JavaScript built-ins such as `toUpperCase()`. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **`this`-based accessor method** — `fullName: function() { return this.firstName + " " + this.lastName; }` combines own properties. [S1]
+- **Late method attachment** — `person.name = function () { ... }` adds behavior to an existing object. [S1]
+- **Method + built-in chaining** — wrap the result and call a built-in: `(this.firstName + " " + this.lastName).toUpperCase()`. [S1]
+
+## 📖 세부 내용 (Details)
+**What are Object Methods?**
+Methods are actions that can be performed on objects. Methods are functions stored as property values. [S1]
+```javascript
+const person = {
+  firstName: "John",
+  lastName: "Doe",
+  age: 50,
+  fullName: function() {
+    return this.firstName + " " + this.lastName;
+  }
+};
+```
+
+| Property | Value |
+| --- | --- |
+| firstName | John |
+| lastName | Doe |
+| age | 50 |
+| **fullName** | **function() { return this.firstName + " " + this.lastName; }** |
+
+**The this Keyword**
+In an object method, `this` refers to the object. [S1]
+```javascript
+const person = {
+  firstName: "John",
+  lastName: "Doe",
+  id: 5566,
+  getId: function() {
+    return this.id;
+  }
+};
+
+let number = person.getId();
+```
+Here `this` refers to the person object; `this.id` means the `id` property of the person object. [S1]
+```javascript
+const person = {
+  firstName: "John",
+  lastName: "Doe",
+  age: 50,
+  fullName: function() {
+    return this.firstName + " " + this.lastName;
+  }
+};
+```
+Here `this` refers to the person object; `this.firstName` means the `firstName` property and `this.lastName` the `lastName` property. [S1]
+
+**Accessing Object Methods**
+To call an object method, add parentheses `()`. Without parentheses you get the function itself. Syntax: [S1]
+```javascript
+objectName.methodName()
+```
+If you call a method with parentheses, it executes as a function: [S1]
+```javascript
+name = person.fullName();
+```
+If you call a method without parentheses, it returns the function definition: [S1]
+```javascript
+name = person.fullName;
+```
+
+**Adding a Method to an Object**
+You can add a method to an object by assigning a function to a property: [S1]
+```javascript
+// Assign person.name to a function
+person.name = function () {
+  return this.firstName + " " + this.lastName;
+};
+```
+Here `person.name` is a property with a function assigned to it. [S1]
+
+**Adding a JavaScript Method**
+This example uses the JavaScript `toUpperCase()` method to convert a text to uppercase: [S1]
+```javascript
+person.name = function () {
+  return (this.firstName + " " + this.lastName).toUpperCase();
+};
+```
+
+**Summary**
+Methods are functions stored as object properties; call a method with parentheses (`person.fullName()`); in methods, `this` refers to the object; you can add methods to objects by assigning a function to a property. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+The page's own snippets are the canonical applied examples — the `fullName`/`getId` methods using `this`, the parentheses-vs-no-parentheses call comparison, and late attachment of `person.name`. No external project/commit applications found in the source.
+
+## 💻 코드 패턴 (Code patterns)
+Method using `this`:
+```javascript
+fullName: function() {
+  return this.firstName + " " + this.lastName;
+}
+```
+Add a method by assignment:
+```javascript
+person.name = function () {
+  return this.firstName + " " + this.lastName;
+};
+```
+Compose with a built-in:
+```javascript
+person.name = function () {
+  return (this.firstName + " " + this.lastName).toUpperCase();
+};
+```
+
+## ⚖️ 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:** 0.89
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[JavaScript Tutorial]]
+- **관련 개념:** [[JavaScript Objects]], [[JavaScript Object Properties]], [[JavaScript Object this]]
+- **참조 맥락:** Referenced whenever attaching behavior to objects and reasoning about `this` inside methods.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — JavaScript Object Methods — https://www.w3schools.com/js/js_object_methods.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-06-23: Initial draft synthesized from the W3Schools "JavaScript Object Methods" page (Astra wiki-curation, P-Reinforce v3.1 format).