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10_Wiki/Topic_Programming/Topic_JavaScript/JavaScript_Function_Intro.md

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+---
+id: javascript-function-definitions
+title: "JavaScript Function Definitions"
+category: "Frontend"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["function definitions", "function declaration", "function syntax", "defining functions", "local variables", "function intro"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.86
+created_at: 2026-06-23
+updated_at: 2026-06-23
+review_reason: ""
+merge_history: []
+tags: ["javascript", "js", "web", "frontend", "w3schools", "functions", "definitions"]
+raw_sources: ["https://www.w3schools.com/js/js_function_intro.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[JavaScript Function Definitions]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+A function is defined with the `function` keyword, a name, a parenthesized parameter list, and a body — once defined it is a reusable block that runs only when called. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Functions are code blocks** — reusable code designed to perform a particular task; they execute when called or invoked. [S1]
+- **Definition syntax** — `function name(p1, p2, ...) { ... }`: keyword, name, comma-separated parameters in parentheses, body in braces. [S1]
+- **Why define functions** — to reuse code (write once, run many times) and organize code into manageable sections. [S1]
+- **Run on call** — the body does not run at definition time; it runs when the function is invoked. [S1]
+- **Local variables** — variables declared inside a function are accessible only within it, created when the function starts and deleted when it completes. [S1]
+- **Functions as variable values** — a function call can be used wherever a value is expected. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Name → parameters → body** — the standard declaration shape that makes a block callable by name. [S1]
+- **Parameterized reuse** — define once with parameters, call repeatedly with different arguments. [S1]
+- **Scope by definition** — placing a `let` inside the function body confines it to that function. [S1]
+
+## 📖 세부 내용 (Details)
+**Functions are Code Blocks** — functions are reusable code blocks designed to perform a particular task; they execute when they are called or invoked. [S1]
+
+**Why Use Functions?** — functions let you reuse code (write once, run many times) and organize code into manageable sections. [S1]
+
+**JavaScript Function Syntax** — a function is defined with the `function` keyword, a name, parameters in parentheses, and a body in curly braces: [S1]
+```javascript
+function name( p1, p2, ... ) {
+  // code to be executed
+}
+```
+
+**What Does a Function Look Like?** — a basic definition: [S1]
+```javascript
+function sayHello() {
+  return "Hello World";
+}
+```
+
+**Functions Run When You Call Them** — the defined function runs only when invoked, and the returned value can be stored: [S1]
+```javascript
+function sayHello() {
+  return "Hello World";
+}
+
+let message = sayHello();
+```
+
+A definition with parameters: [S1]
+```javascript
+function multiply(a, b) {
+  return a * b;
+}
+```
+
+**A Function Can Be Used Many Times** — the same definition is reused with different arguments: [S1]
+```javascript
+function add(a, b) {
+  return a + b;
+}
+
+let sum1 = add(5, 5);
+let sum2 = add(50, 50);
+```
+
+**Local Variables** — variables declared inside a function can only be accessed from within the function; they are created when the function starts and deleted when it completes: [S1]
+```javascript
+// code here can NOT use carName
+
+function myFunction() {
+  let carName = "Volvo";
+  // code here CAN use carName
+}
+
+// code here can NOT use carName
+```
+
+**Functions Used as Variables** — a function call can be used directly inside an expression: [S1]
+```javascript
+let x = toCelsius(77);
+let text = "The temperature is " + x + " Celsius";
+```
+And inlined directly: [S1]
+```javascript
+let text = "The temperature is " + toCelsius(77) + " Celsius";
+```
+
+## 🛠️ 적용 사례 (Applied in summary)
+The page's own snippets are the canonical applied examples — defining `sayHello()`, `multiply(a, b)`, the reusable `add(a, b)`, the scoped `myFunction()`, and using `toCelsius(77)` as a value. No external project/commit applications found in the source.
+
+## 💻 코드 패턴 (Code patterns)
+Define a function (language: JavaScript):
+```javascript
+function name( p1, p2, ... ) {
+  // code to be executed
+}
+```
+Define and reuse with parameters:
+```javascript
+function add(a, b) {
+  return a + b;
+}
+
+let sum1 = add(5, 5);
+let sum2 = add(50, 50);
+```
+Confine a variable to a function:
+```javascript
+function myFunction() {
+  let carName = "Volvo";
+}
+```
+
+## ⚖️ 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:** 0.86
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[JavaScript Tutorial]]
+- **관련 개념:** [[JavaScript Functions]], [[JavaScript Function Invocation]], [[JavaScript Function Parameters]], [[JavaScript Function Returns]]
+- **참조 맥락:** Referenced when learning how to declare and scope a reusable callable block.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — JavaScript Function Definitions — https://www.w3schools.com/js/js_function_intro.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-06-23: Initial draft synthesized from the W3Schools "JavaScript Function Definitions" page (Astra wiki-curation, P-Reinforce v3.1 format).