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113 lines
4.6 KiB
Markdown
113 lines
4.6 KiB
Markdown
---
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id: javascript-ternary
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title: "JavaScript Ternary"
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category: "Frontend"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["ternary operator", "conditional operator", "JS ternary", "?: operator", "shorthand if else"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.9
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created_at: 2026-06-23
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updated_at: 2026-06-23
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review_reason: ""
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merge_history: []
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tags: ["javascript", "js", "web", "frontend", "w3schools", "ternary", "operators", "conditional"]
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raw_sources: ["https://www.w3schools.com/js/js_if_ternary.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[JavaScript Ternary]]
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## 🎯 한 줄 통찰 (One-line insight)
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The conditional (ternary) operator is a shorthand for an `if...else` statement — it is the only JavaScript operator that takes three operands. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Shorthand for `if...else`** — the conditional operator is a shorthand for writing conditional `if...else` statements. [S1]
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- **Three operands** — it is called a ternary operator because it takes three operands, and it is the only JavaScript operator that takes three operands. [S1]
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- **Returns one of two values** — it evaluates a condition and returns `expression1` if the condition is `true`, otherwise `expression2`. [S1]
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- **Standardized early** — `() ? x : y` is an ES1 feature (JavaScript 1997) and is fully supported in all browsers. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Inline conditional assignment** — assign one of two values to a variable in a single expression based on a test, e.g. `let text = (age < 18) ? "Minor" : "Adult";`. [S1]
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- **Flag-driven value selection** — use a boolean flag as the condition to pick between two literal values (e.g. a discount rate). [S1]
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## 📖 세부 내용 (Details)
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**The conditional (ternary) operator** [S1]
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The conditional operator is a shorthand for writing conditional `if...else` statements. It is called a ternary operator because it takes three operands.
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**Syntax** [S1]
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```
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(condition) ? expression1 : expression2
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```
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**Assigning a value based on a condition** [S1]
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```javascript
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let text = (age < 18) ? "Minor" : "Adult";
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```
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**Flag-driven selection — true branch** [S1]
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```javascript
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let isMember = true;
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let discount = isMember ? 0.2 : 0;
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```
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**Flag-driven selection — false branch** [S1]
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```javascript
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let isMember = false;
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let discount = isMember ? 0.2 : 0;
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```
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**Parameters** [S1]
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| Parameter | Description |
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|-----------|-------------|
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| condition | Required. The condition to be tested. An expression that evaluates to `true` or `false`. |
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| ? | Required. The operator separating the condition from the expressions. |
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| expression1 | Required. The value to return if the condition is `true`. |
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| : | Required. The operator separating the expressions. |
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| expression2 | Required. The value to return if the condition is `false`. |
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**Note** [S1]
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The conditional (ternary) operator is the only JavaScript operator that takes three operands.
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**Browser support** [S1]
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`() ? x : y` is an ES1 feature (JavaScript 1997). It is fully supported in all browsers.
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## 🛠️ 적용 사례 (Applied in summary)
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The page's own snippets are the canonical applied examples — selecting between `"Minor"`/`"Adult"` based on `age`, and choosing a `discount` based on an `isMember` flag. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Inline conditional assignment:
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```javascript
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let text = (age < 18) ? "Minor" : "Adult";
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```
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Flag-driven value selection:
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```javascript
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let isMember = true;
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let discount = isMember ? 0.2 : 0;
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```
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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No contradictions found in the source.
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual (실제 적용 사례 발견 시 applied/validated로 승격 가능)
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.90
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[JavaScript Tutorial]]
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- **관련 개념:** [[JavaScript If Else]], [[JavaScript Switch]], [[JavaScript Comparisons]], [[JavaScript Booleans]]
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- **참조 맥락:** Used wherever a compact `if...else` value selection is needed inline within an expression.
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## 📚 출처 (Sources)
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- [S1] W3Schools — JavaScript Ternary — https://www.w3schools.com/js/js_if_ternary.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "JavaScript Ternary" page (Astra wiki-curation, P-Reinforce v3.1 format).
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