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10_Wiki/Topic_Programming/Topic_JavaScript/JavaScript_Function_Parameters.md

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+---
+id: javascript-function-parameters
+title: "JavaScript Function Parameters"
+category: "Frontend"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["function parameters", "arguments", "parameters vs arguments", "default parameters", "parameter rules", "function input"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.87
+created_at: 2026-06-23
+updated_at: 2026-06-23
+review_reason: ""
+merge_history: []
+tags: ["javascript", "js", "web", "frontend", "w3schools", "functions", "parameters"]
+raw_sources: ["https://www.w3schools.com/js/js_function_parameters.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[JavaScript Function Parameters]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+Parameters are the named inputs a function declares in its parentheses; arguments are the real values passed in when it is called — and JavaScript checks neither their types nor their count. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **Parameters pass values in** — parameters allow you to send values to a function and are listed inside the parentheses in the function definition. [S1]
+- **Parameters vs arguments** — parameters are the names listed in the function definition; arguments are the real values passed to and received by the function. [S1]
+- **No type or count enforcement** — JavaScript function definitions do not specify data types for parameters, do not perform type checking on arguments, and do not check the number of arguments received. [S1]
+- **Missing arguments give wrong results** — accessing a function with an incorrect (missing) parameter can return an incorrect answer. [S1]
+- **Default parameter values** — ECMAScript 2015 allows function parameters to have default values, used when no argument is provided. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **One or many parameters** — declare a single parameter, or as many as needed separated by commas. [S1]
+- **Default fallback** — `function f(x, y = 10)` supplies `10` when the second argument is omitted. [S1]
+- **No safety net** — because there is no type/count checking, a missing argument silently flows through (e.g. `toCelsius()` with no input). [S1]
+
+## 📖 세부 내용 (Details)
+**Parameters (Function Input)** — parameters allow you to pass (send) values to a function; they are listed inside the parentheses in the function definition. [S1]
+
+**Functions with One Parameter** — a function can have one parameter: [S1]
+```javascript
+function sayHello(name) {
+  return "Hello " + name;
+}
+
+let greeting = sayHello("John");
+```
+
+A single-parameter conversion: [S1]
+```javascript
+function toCelsius(fahrenheit) {
+  return (5 / 9) * (fahrenheit - 32);
+}
+
+let value = toCelsius(77);
+```
+
+**Functions with Multiple Parameters** — you can add as many parameters as you want, separated by commas: [S1]
+```javascript
+function multiply(a, b) {
+  return a * b;
+}
+
+let result = multiply(4, 5);
+```
+```javascript
+function fullName(firstName, lastName) {
+  return firstName + " " + lastName;
+}
+
+let name = fullName("John", "Doe");
+```
+
+**Parameters vs. Arguments** — parameters are the names listed in the function definition; arguments are the real values passed to and received by the function. [S1]
+
+**Parameter Rules** — JavaScript function definitions do not specify data types for parameters; JavaScript functions do not perform type checking on the arguments; JavaScript functions do not check the number of arguments received. [S1]
+
+**Incorrect Parameters** — accessing a function with an incorrect (missing) parameter can return an incorrect answer: [S1]
+```javascript
+function toCelsius(fahrenheit) {
+  return (5/9) * (fahrenheit-32);
+}
+
+let value = toCelsius();
+```
+
+**Default Parameter Values** — ECMAScript 2015 allows function parameters to have default values; the default value is used if no argument is provided: [S1]
+```javascript
+function myFunction(x, y = 10) {
+  return x + y;
+}
+myFunction(5);
+```
+
+## 🛠️ 적용 사례 (Applied in summary)
+The page's own snippets are the canonical applied examples — single-parameter `sayHello(name)` and `toCelsius(fahrenheit)`, multi-parameter `multiply(a, b)` and `fullName(firstName, lastName)`, the missing-argument `toCelsius()` case, and the default-parameter `myFunction(x, y = 10)`. No external project/commit applications found in the source.
+
+## 💻 코드 패턴 (Code patterns)
+Multiple parameters (language: JavaScript):
+```javascript
+function fullName(firstName, lastName) {
+  return firstName + " " + lastName;
+}
+
+let name = fullName("John", "Doe");
+```
+Default parameter value:
+```javascript
+function myFunction(x, y = 10) {
+  return x + y;
+}
+myFunction(5);
+```
+
+## ⚖️ 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:** 0.87
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[JavaScript Tutorial]]
+- **관련 개념:** [[JavaScript Functions]], [[JavaScript Function Definitions]], [[JavaScript Function Invocation]], [[JavaScript Function Returns]]
+- **참조 맥락:** Referenced when designing a function's inputs, defaults, and how callers supply arguments.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — JavaScript Function Parameters — https://www.w3schools.com/js/js_function_parameters.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-06-23: Initial draft synthesized from the W3Schools "JavaScript Function Parameters" page (Astra wiki-curation, P-Reinforce v3.1 format).