2nd/10_Wiki/Topics/Domain_Programming/Topic_JavaScript/JavaScript_Ternary.md

id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit

id	title	category	status	verification_status	canonical_id	aliases	duplicate_of	source_trust_level	confidence_score	created_at	updated_at	review_reason	merge_history	tags	raw_sources	applied_in	github_commit
javascript-ternary	JavaScript Ternary	Frontend	draft	conceptual		ternary operator conditional operator JS ternary ?: operator shorthand if else		B	0.9	2026-06-23	2026-06-23			javascript js web frontend w3schools ternary operators conditional	https://www.w3schools.com/js/js_if_ternary.asp

JavaScript Ternary

🎯 한 줄 통찰 (One-line insight)

The conditional (ternary) operator is a shorthand for an if...else statement — it is the only JavaScript operator that takes three operands. [S1]

🧠 핵심 개념 (Core concepts)

• Shorthand for if...else — the conditional operator is a shorthand for writing conditional if...else statements. [S1]
• 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]
• Returns one of two values — it evaluates a condition and returns expression1 if the condition is true, otherwise expression2. [S1]
• Standardized early — () ? x : y is an ES1 feature (JavaScript 1997) and is fully supported in all browsers. [S1]

🧩 추출된 패턴 (Extracted patterns)

• 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]
• Flag-driven value selection — use a boolean flag as the condition to pick between two literal values (e.g. a discount rate). [S1]

📖 세부 내용 (Details)

The conditional (ternary) operator [S1] The conditional operator is a shorthand for writing conditional if...else statements. It is called a ternary operator because it takes three operands.

Syntax [S1]

(condition) ? expression1 : expression2

Assigning a value based on a condition [S1]

let text = (age < 18) ? "Minor" : "Adult";

Flag-driven selection — true branch [S1]

let isMember = true;
let discount = isMember ? 0.2 : 0;

Flag-driven selection — false branch [S1]

let isMember = false;
let discount = isMember ? 0.2 : 0;

Parameters [S1]

Parameter	Description
condition	Required. The condition to be tested. An expression that evaluates to true or false.
?	Required. The operator separating the condition from the expressions.
expression1	Required. The value to return if the condition is true.
:	Required. The operator separating the expressions.
expression2	Required. The value to return if the condition is false.

Note [S1] The conditional (ternary) operator is the only JavaScript operator that takes three operands.

Browser support [S1] () ? x : y is an ES1 feature (JavaScript 1997). It is fully supported in all browsers.

🛠️ 적용 사례 (Applied in summary)

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.

💻 코드 패턴 (Code patterns)

Inline conditional assignment:

let text = (age < 18) ? "Minor" : "Adult";

Flag-driven value selection:

let isMember = true;
let discount = isMember ? 0.2 : 0;

⚖️ 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: 0.90
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: JavaScript Tutorial
• 관련 개념: JavaScript If Else, JavaScript Switch, JavaScript Comparisons, JavaScript Booleans
• 참조 맥락: Used wherever a compact if...else value selection is needed inline within an expression.

📚 출처 (Sources)

• [S1] W3Schools — JavaScript Ternary — https://www.w3schools.com/js/js_if_ternary.asp

📝 변경 이력 (Change history)

• 2026-06-23: Initial draft synthesized from the W3Schools "JavaScript Ternary" page (Astra wiki-curation, P-Reinforce v3.1 format).