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10_Wiki/Topic_Programming/Topic_JavaScript/JavaScript_If.md

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+---
+id: javascript-if
+title: "JavaScript If"
+category: "Frontend"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["JS if statement", "if statement", "nested if", "conditional execution", "logical AND in if", "if syntax"]
+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", "if", "control-flow"]
+raw_sources: ["https://www.w3schools.com/js/js_if.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[JavaScript If]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+Use the JavaScript `if` statement to execute a block of code when a condition is `true` — and `if` must be lowercase, since `If`/`IF` raise an error. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`if` runs code when true** — use the `if` statement to execute a block of code when a condition is `true`. [S1]
+- **Lowercase only** — `if` must be in lowercase; uppercase `If` or `IF` will generate a JavaScript error. [S1]
+- **Braced block** — the code to run conditionally goes inside `{ ... }` after the parenthesized condition. [S1]
+- **Nesting works but adds complexity** — `if` statements can be nested, but nesting makes code more complex. [S1]
+- **Prefer logical AND over nesting** — a better solution than nesting two `if`s is to combine conditions with the logical AND operator `&&`. [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **Default-then-override** — set a default value, then override it inside an `if` when the condition holds. [S1]
+- **Flatten nesting with `&&`** — replace `if (A) { if (B) {...} }` with `if (A && B) {...}`. [S1]
+
+## 📖 세부 내용 (Details)
+**The JavaScript if Statement** [S1]
+Use the JavaScript `if` statement to execute a block of code when a condition is `true`.
+
+**Syntax** [S1]
+```
+if (condition) {
+  //  block of code to be executed if the condition is true
+}
+```
+
+**Note** [S1]
+Note that `if` is in lowercase letters. Uppercase letters (`If` or `IF`) will generate a JavaScript error.
+
+A basic `if` setting a greeting: [S1]
+```javascript
+if (hour < 18) {
+  greeting = "Good day";
+}
+```
+
+A default-then-override example where the condition is true: [S1]
+```javascript
+let age = 18;
+let text = "You can Not drive";
+
+if (age >= 18) {
+  text = "You can drive";
+}
+```
+
+The same pattern where the condition is false (the default is kept): [S1]
+```javascript
+let age = 16;
+let text = "You can Not drive";
+
+if (age >= 18) {
+  text = "You can drive";
+}
+```
+
+**Nested if** [S1]
+Nested if statements can make your code more complex:
+```javascript
+let age = 16;
+let country = "USA";
+let text = "You can Not drive!";
+
+if (country == "USA") {
+  if (age >= 16) {
+    text = "You can drive!";
+  }
+}
+```
+A better solution is to use the logical AND operator:
+```javascript
+let age = 16;
+let country = "USA";
+let text = "You can Not drive!";
+
+if (country == "USA" && age >= 16) {
+  text = "You can drive!";
+}
+```
+
+## 🛠️ 적용 사례 (Applied in summary)
+The page's own snippets are the canonical applied examples — greeting based on `hour`, a driving-eligibility check with default-then-override, and flattening a nested `if` into a single `&&` condition. No external project/commit applications found in the source.
+
+## 💻 코드 패턴 (Code patterns)
+Default then override on a true condition:
+```javascript
+let age = 18;
+let text = "You can Not drive";
+
+if (age >= 18) {
+  text = "You can drive";
+}
+```
+Combine conditions with logical AND instead of nesting:
+```javascript
+if (country == "USA" && age >= 16) {
+  text = "You can drive!";
+}
+```
+
+## ⚖️ 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 If Else]], [[JavaScript Conditional Operators]], [[JavaScript Comparisons]], [[JavaScript Operators]]
+- **참조 맥락:** The foundational branching statement, referenced before adding `else`/`else if` or a `switch`.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — JavaScript If — https://www.w3schools.com/js/js_if.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-06-23: Initial draft synthesized from the W3Schools "JavaScript If" page (Astra wiki-curation, P-Reinforce v3.1 format).