Number.NEGATIVE_INFINITY is the IEEE-754 value -Infinity — the same as -Infinity and -Number.POSITIVE_INFINITY. Results more negative than -Number.MAX_VALUE overflow to it. It is a static property, not a method.
Read the notes below before you rely on this property. Prefer feature detection when support is limited.
Use Number.NEGATIVE_INFINITY. Start with this line.
Number.NEGATIVE_INFINITY| Call | What it does |
|---|---|
Number.NEGATIVE_INFINITY | Primary signature. |
Built into JavaScript. Read Number.NEGATIVE_INFINITY on the Number constructor — no import required.
Number.NEGATIVE_INFINITYThis member has no parameters beyond those shown in the signature.
| Return Value | Description |
|---|---|
| * | The current value of Number.NEGATIVE_INFINITY. |
Number.NEGATIVE_INFINITYConfirm it matches the -Infinity literal.
console.log(Number.NEGATIVE_INFINITY);
console.log(Number.NEGATIVE_INFINITY === -Infinity);
console.log(-1 / 0);Number.NEGATIVE_INFINITY on the constructor.-Infinity literal.-1 / 0 is a common way to produce the same value.(1).NEGATIVE_INFINITY.-MAX_VALUEFinite floor vs true negative infinity after overflow.
console.log(-Number.MAX_VALUE); // finite
console.log(-Number.MAX_VALUE * 2); // -Infinity
console.log(-Number.MAX_VALUE * 2 === Number.NEGATIVE_INFINITY);-Number.MAX_VALUE is still a real finite Number.-Infinity.Number.NEGATIVE_INFINITY.Number.isFiniteTreat -Infinity like other non-finite values.
console.log(Number.isFinite(Number.NEGATIVE_INFINITY)); // false
console.log(Number.isFinite(-3.5)); // true
console.log(Number.NEGATIVE_INFINITY === -Number.POSITIVE_INFINITY);Number.isFinite(-Infinity) is false.-3.5 still return true.POSITIVE_INFINITY yields the same constant.isFinite before toFixed or charts.Number.NEGATIVE_INFINITY has been available for many years and is Baseline Widely available in modern browsers and Node.js.
Supported in Chrome, Firefox, Safari, Edge, and Node.js. Safe for modern apps without a polyfill.
Bottom line: Use Number.NEGATIVE_INFINITY or -Infinity freely. Prefer Number.isFinite when you need to reject all non-finite values.
Learn Number.NaN — why NaN never equals itself and how to detect it safely.
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