2nd/10_Wiki/Topics/Domain_Programming/Topic_JavaScript/JavaScript_Comments.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-comments	JavaScript Comments	Frontend	draft	conceptual		JS comments single line comment multi-line comment block comment prevent execution		B	0.89	2026-06-23	2026-06-23			javascript js web frontend w3schools comments	https://www.w3schools.com/js/js_comments.asp

JavaScript Comments

🎯 한 줄 통찰 (One-line insight)

JavaScript comments explain code and improve readability — single-line comments start with //, multi-line comments are wrapped in /* */, and either form can also be used to prevent code from executing. [S1]

🧠 핵심 개념 (Core concepts)

• Purpose of comments — comments can be used to explain JavaScript code and to make it more readable; they can also be used to prevent execution when testing alternative code. [S1]
• Single line comments — start with //; any text between // and the end of the line is ignored (not executed). [S1]
• Multi-line comments — start with /* and end with */; any text between is ignored. [S1]
• Comments to prevent execution — placing // or /* */ around code lines is a convenient way to prevent execution, e.g. while debugging. [S1]

🧩 추출된 패턴 (Extracted patterns)

• End-of-line annotation — append // ... after a statement to document what that line does. [S1]
• Block intro comment — use a /* ... */ block before a group of statements to describe what the following code does. [S1]
• Comment-out for debugging — prefix a single line with //, or wrap several lines in /* */, to temporarily disable them. [S1]

📖 세부 내용 (Details)

Single Line Comments — Single line comments start with //. Any text between // and the end of the line will be ignored by JavaScript (will not be executed). This example uses a single line comment before each line of code: [S1]

// Change heading:
document.getElementById("myH").innerHTML = "My First Page";

// Change paragraph:
document.getElementById("myP").innerHTML = "My first paragraph.";

This example uses a single line comment at the end of each line to explain the code: [S1]

let x = 5;      // Declare x, give it the value of 5
let y = x + 2;  // Declare y, give it the value of x + 2

Multi-line Comments — Multi-line comments start with /* and end with */. Any text between /* and */ will be ignored by JavaScript. This example uses a multi-line comment (a comment block) to explain the code: [S1]

/*
The code below will change
the heading with id = "myH"
and the paragraph with id = "myP"
in my web page:
*/
document.getElementById("myH").innerHTML = "My First Page";
document.getElementById("myP").innerHTML = "My first paragraph.";

Using Comments to Prevent Execution — Using comments to prevent execution of code is suitable for testing. Adding // in front of a code line changes the lines from an executable line to a comment: [S1]

//document.getElementById("myH").innerHTML = "My First Page";
document.getElementById("myP").innerHTML = "My first paragraph.";

This example uses a comment block to prevent execution of multiple lines: [S1]

/*
document.getElementById("myH").innerHTML = "My First Page";
document.getElementById("myP").innerHTML = "My first paragraph.";
*/

🛠️ 적용 사례 (Applied in summary)

The page's own snippets are the canonical applied examples — single-line intro/end-of-line comments, a multi-line explanatory block, and commenting out one line vs a multi-line block to prevent execution. No external project/commit applications found in the source.

💻 코드 패턴 (Code patterns)

Single line, end-of-line:

let x = 5;      // Declare x, give it the value of 5

Multi-line block:

/*
This block describes the code below.
*/

Comment out to disable:

//document.getElementById("myH").innerHTML = "My First Page";

⚖️ 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 Syntax, JavaScript Statements, JavaScript Variables
• 참조 맥락: Documentation practice referenced across every code example in the tutorial.

📚 출처 (Sources)

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

📝 변경 이력 (Change history)

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