Number.POSITIVEINFINITY

## Value

The same as the value of the global {{jsxref("Infinity")}} property.

{{js_property_attributes(0, 0, 0)}}

## Description

The `Number.POSITIVE_INFINITY` value behaves slightly differently than mathematical infinity:

- Any positive value, including `POSITIVE_INFINITY`, multiplied by `POSITIVE_INFINITY` is `POSITIVE_INFINITY`.
- Any negative value, including {{jsxref("Number/NEGATIVE_INFINITY", "NEGATIVE_INFINITY")}}, multiplied by `POSITIVE_INFINITY` is {{jsxref("Number/NEGATIVE_INFINITY", "NEGATIVE_INFINITY")}}.
- Any positive number divided by `POSITIVE_INFINITY` is [positive zero](https://en.wikipedia.org/wiki/Signed_zero) (as defined in [IEEE 754](https://en.wikipedia.org/wiki/IEEE_754)).
- Any negative number divided by `POSITIVE_INFINITY` is [negative zero](https://en.wikipedia.org/wiki/Signed_zero) (as defined in [IEEE 754](https://en.wikipedia.org/wiki/IEEE_754).
- Zero multiplied by `POSITIVE_INFINITY` is {{jsxref("NaN")}}.
- {{jsxref("NaN")}} multiplied by `POSITIVE_INFINITY` is {{jsxref("NaN")}}.
- `POSITIVE_INFINITY`, divided by any negative value except {{jsxref("Number/NEGATIVE_INFINITY", "NEGATIVE_INFINITY")}}, is {{jsxref("Number/NEGATIVE_INFINITY", "NEGATIVE_INFINITY")}}.
- `POSITIVE_INFINITY`, divided by any positive value except `POSITIVE_INFINITY`, is `POSITIVE_INFINITY`.
- `POSITIVE_INFINITY`, divided by either {{jsxref("Number/NEGATIVE_INFINITY", "NEGATIVE_INFINITY")}} or `POSITIVE_INFINITY`, is {{jsxref("NaN")}}.
- `Number.POSITIVE_INFINITY > x` is true for any number _x_ that isn't `POSITIVE_INFINITY`.

You might use the `Number.POSITIVE_INFINITY` property to indicate an error condition that returns a finite number in case of success. Note, however, that {{jsxref("NaN")}} would be more appropriate in such a case.

Because `POSITIVE_INFINITY` is a static property of {{jsxref("Number")}}, you always use it as `Number.POSITIVE_INFINITY`, rather than as a property of a number value.

## Examples

### Using POSITIVE_INFINITY

In the following example, the variable `bigNumber` is assigned a value that is larger than the maximum value. When the {{jsxref("Statements/if...else", "if")}} statement executes, `bigNumber` has the value `Infinity`, so `bigNumber` is set to a more manageable value before continuing.

```js
let bigNumber = Number.MAX_VALUE * 2;

if (bigNumber === Number.POSITIVE_INFINITY) {
  bigNumber = returnFinite();
}