2nd/10_Wiki/Topic_JavaScript/JavaScript_Operators.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-operators	JavaScript Operators	Frontend	draft	conceptual		JS operators JavaScript operator types arithmetic operators assignment operators comparison operators logical operators concatenation operator		B	0.88	2026-06-23	2026-06-23			javascript js web frontend w3schools operators	https://www.w3schools.com/js/js_operators.asp

JavaScript Operators

🎯 한 줄 통찰 (One-line insight)

JavaScript operators are used for mathematical and logical computations — the = assigns, + adds (and concatenates strings), * multiplies, and comparison/logical operators evaluate conditions. [S1]

🧠 핵심 개념 (Core concepts)

• Operators are for mathematical and logical computations — they perform operations on values and variables. [S1]
• Four core single examples — the assignment operator = assigns values, the addition operator + adds, the multiplication operator * multiplies, and the comparison operator > compares. [S1]
• Operator categories — JavaScript operators include Arithmetic, Assignment, Comparison, Logical, and String operators. [S1]
• + is overloaded — when used on strings, the + operator is called the concatenation operator; if you add a number and a string, the result is a string. [S1]
• Comparisons return booleans — comparison operators always return true or false, and strings are compared alphabetically. [S1]

🧩 추출된 패턴 (Extracted patterns)

• Compute into a new variable — combine two operands with an arithmetic operator and store the result: let z = x + y;. [S1]
• Compound assignment — x += 5 is shorthand for x = x + 5. [S1]
• Concatenate then assign — build a string with + and a separator: text1 + " " + text2. [S1]

📖 세부 내용 (Details)

Operators are for Mathematical and Logical Computations [S1] The assignment operator (=) assigns a value to a variable:

let x = 10;

The addition operator (+) adds values:

let x = 5;
let y = 2;
let z = x + y;

The multiplication operator (*) multiplies values:

let x = 5;
let y = 2;
let z = x * y;

A more complex expression mixing addition and multiplication: [S1]

let a = 3;
let x = (100 + 50) * a;

Types of JavaScript Operators [S1] There are different types of JavaScript operators: Arithmetic, Assignment, Comparison, String, Logical, and others.

JavaScript Arithmetic Operators [S1] Arithmetic operators are used to perform arithmetic on numbers:

Operator	Description
+	Addition
-	Subtraction
*	Multiplication
**	Exponentiation
/	Division
%	Modulus (Division Remainder)
++	Increment
--	Decrement

JavaScript String Addition [S1] When used on strings, the + operator is called the concatenation operator:

let text1 = "John";
let text2 = "Doe";
let text3 = text1 + " " + text2;

The += assignment operator can also concatenate:

let text1 = "What a very ";
text1 += "nice day";

Adding Strings and Numbers [S1] If you add a number and a string, the result will be a string:

let x = 5 + 5;
let y = "5" + 5;
let z = "Hello" + 5;

JavaScript Assignment Operators [S1] Assignment operators assign values to JavaScript variables. For example, x += 5 is the same as x = x + 5:

let x = 10;
x += 5;

Operator	Example	Same As
=	x = y	x = y
+=	x += y	x = x + y
-=	x -= y	x = x - y
*=	x *= y	x = x * y
/=	x /= y	x = x / y
%=	x %= y	x = x % y
**=	x **= y	x = x ** y

JavaScript Comparison Operators [S1] Comparison operators always return true or false:

let x = 5;
let result = x > 8;

Operator	Description	Example
==	equal to	x == 5
===	equal value and equal type	x === 5
!=	not equal	x != 5
!==	not equal value or not equal type	x !== 5
>	greater than	x > 5
<	less than	x < 5
>=	greater than or equal to	x >= 5
<=	less than or equal to	x <= 5

Strings are compared alphabetically: [S1]

let text1 = "A";
let text2 = "B";
let result = text1 < text2;

JavaScript Logical Operators [S1]

Operator	Description
&&	logical and
||	logical or
!	logical not

🛠️ 적용 사례 (Applied in summary)

The page's own snippets are the canonical applied examples — assigning with =, computing with +/*, concatenating strings, compound-assigning with +=, and comparing values/strings. No external project/commit applications found in the source.

💻 코드 패턴 (Code patterns)

Compute and store a result:

let x = 5;
let y = 2;
let z = x + y;

Concatenate strings with a separator:

let text3 = text1 + " " + text2;

Compound assignment:

let x = 10;
x += 5;

⚖️ 모순 및 업데이트 (Contradictions & updates)

No contradictions found in the source. The behavior that "5" + 5 yields a string ("55") rather than 10 is intentional, not a contradiction — + concatenates when a string operand is present.

✅ 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: 0.88
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: JavaScript Tutorial
• 관련 개념: JavaScript Arithmetic, JavaScript Assignment, JavaScript Comparisons, JavaScript Types
• 참조 맥락: The umbrella reference for the operator-family pages (arithmetic, assignment, comparison, logical) that follow it.

📚 출처 (Sources)

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

📝 변경 이력 (Change history)

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