Number.POSITIVE_INFINITY is the IEEE-754 value Infinity — the same as the global Infinity and -Number.NEGATIVE_INFINITY. Results larger 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.POSITIVE_INFINITY. Start with this line.
Number.POSITIVE_INFINITY| Call | What it does |
|---|---|
Number.POSITIVE_INFINITY | Primary signature. |
Built into JavaScript. Read Number.POSITIVE_INFINITY on the Number constructor — no import required.
Number.POSITIVE_INFINITYThis member has no parameters beyond those shown in the signature.
| Return Value | Description |
|---|---|
| * | The current value of Number.POSITIVE_INFINITY. |
Number.POSITIVE_INFINITYConfirm it matches the global Infinity literal.
console.log(Number.POSITIVE_INFINITY);
console.log(Number.POSITIVE_INFINITY === Infinity);
console.log(1 / 0);Number.POSITIVE_INFINITY on the constructor.Infinity value.1 / 0 is a common way to produce the same value.(1).POSITIVE_INFINITY.MAX_VALUEFinite ceiling vs true positive infinity after overflow.
console.log(Number.MAX_VALUE); // finite
console.log(Number.MAX_VALUE * 2); // Infinity
console.log(Number.MAX_VALUE * 2 === Number.POSITIVE_INFINITY);Number.MAX_VALUE is still a real finite Number.Infinity.Number.POSITIVE_INFINITY.Number.isFiniteTreat Infinity like other non-finite values.
console.log(Number.isFinite(Number.POSITIVE_INFINITY)); // false
console.log(Number.isFinite(3.5)); // true
console.log(Number.POSITIVE_INFINITY === -Number.NEGATIVE_INFINITY);Number.isFinite(Infinity) is false.3.5 still return true.NEGATIVE_INFINITY yields the same constant.isFinite before toFixed or charts.Number.POSITIVE_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.POSITIVE_INFINITY or Infinity freely. Prefer Number.isFinite when you need to reject all non-finite values.
Learn the signed -Infinity constant and negative overflow past -MAX_VALUE.
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