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title

JavaScript Number Properties

🎯 한 줄 통찰 (One-line insight)

JavaScript Number properties are static constants on the Number object that expose the limits of the language's numeric type — its largest, smallest, safe-integer bounds, infinities, and the not-a-number value. [S1]

🧠 핵심 개념 (Core concepts)

Number properties are static — they belong to the Number object itself and can only be accessed as Number.PROPERTY (for example Number.MAX_VALUE), never through a number variable or instance. [S1]
EPSILON is the difference between 1 and the smallest floating-point number greater than 1. [S1]
MAX_VALUE / MIN_VALUE are the largest and lowest possible numbers in JavaScript. [S1]
MAX_SAFE_INTEGER / MIN_SAFE_INTEGER are 2⁵³ − 1 and −(2⁵³ − 1) — the bounds of integers that can be represented exactly. [S1]
POSITIVE_INFINITY / NEGATIVE_INFINITY are returned on numeric overflow (for example 1 / 0 and -1 / 0). [S1]
NaN ("Not a Number") is returned by invalid arithmetic such as dividing a number by a non-numeric string. [S1]

🧩 추출된 패턴 (Extracted patterns)

Static access only — reach a property as Number.MAX_VALUE; reading the same name off a variable (x.MAX_VALUE) yields undefined. [S1]
Overflow → Infinity — operations that exceed the representable range produce Infinity rather than throwing an error. [S1]
Invalid arithmetic → NaN — mixing a number with a non-numeric string in arithmetic produces NaN. [S1]

📖 세부 내용 (Details)

Number properties belong to the JavaScript Number object. These properties can only be accessed as Number.MAX_VALUE (statically), not on a variable. [S1]

JavaScript EPSILON — the difference between 1 and the smallest floating-point number greater than 1: [S1]

let x = Number.EPSILON;

JavaScript MAX_VALUE — the largest possible number in JavaScript: [S1]

let x = Number.MAX_VALUE;

Number Properties Cannot be Used on Variables — accessing a property name on a number variable returns undefined: [S1]

let x = 6;
x.MAX_VALUE

JavaScript MIN_VALUE — the lowest possible number in JavaScript: [S1]

let x = Number.MIN_VALUE;

JavaScript MIN_SAFE_INTEGER — −(2⁵³ − 1): [S1]

let x = Number.MIN_SAFE_INTEGER;

JavaScript MAX_SAFE_INTEGER — 2⁵³ − 1: [S1]

let x = Number.MAX_SAFE_INTEGER;

JavaScript POSITIVE_INFINITY — accessed as a property: [S1]

let x = Number.POSITIVE_INFINITY;

POSITIVE_INFINITY is returned on overflow: [S1]

let x = 1 / 0;

JavaScript NEGATIVE_INFINITY — accessed as a property: [S1]

let x = Number.NEGATIVE_INFINITY;

NEGATIVE_INFINITY is returned on overflow: [S1]

let x = -1 / 0;

JavaScript NaN — Not a Number — accessed as a property: [S1]

let x = Number.NaN;

NaN also results from invalid arithmetic, such as dividing by a non-numeric string: [S1]

let x = 100 / "Apple";

Property summary table [S1]

Property	Description
`Number.EPSILON`	The difference between 1 and the smallest floating-point number greater than 1
`Number.MAX_VALUE`	The largest possible number in JavaScript
`Number.MIN_VALUE`	The lowest possible number in JavaScript
`Number.MAX_SAFE_INTEGER`	The maximum safe integer (`2⁵³ − 1`)
`Number.MIN_SAFE_INTEGER`	The minimum safe integer (`−(2⁵³ − 1)`)
`Number.POSITIVE_INFINITY`	Returned on overflow (e.g. `1 / 0`)
`Number.NEGATIVE_INFINITY`	Returned on negative overflow (e.g. `-1 / 0`)
`Number.NaN`	Not a Number (e.g. `100 / "Apple"`)

🛠️ 적용 사례 (Applied in summary)

The page's own snippets are the canonical applied examples — accessing each constant via Number.* and demonstrating overflow (1 / 0) and invalid arithmetic (100 / "Apple"). No external project/commit applications found in the source.

💻 코드 패턴 (Code patterns)

Access a static Number property (language: JavaScript):

let x = Number.MAX_VALUE;
let y = Number.MAX_SAFE_INTEGER;

Trigger Infinity through overflow:

let x = 1 / 0;
let y = -1 / 0;

Produce NaN through invalid arithmetic:

let x = 100 / "Apple";

⚖️ 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: 0.88
중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

상위/루트: JavaScript Tutorial
관련 개념: JavaScript Numbers, JavaScript Number Methods, JavaScript BigInt, JavaScript Bitwise
참조 맥락: Referenced when checking numeric limits, detecting overflow, or guarding against unsafe integers.

📚 출처 (Sources)

[S1] W3Schools — JavaScript Number Properties — https://www.w3schools.com/js/js_number_properties.asp

📝 변경 이력 (Change history)

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

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