Number.NEGATIVEINFINITY

## Value

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

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

## Description

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

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

You might use the `Number.NEGATIVE_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 `NEGATIVE_INFINITY` is a static property of {{jsxref("Number")}}, you always use it as `Number.NEGATIVE_INFINITY`, rather than as a property of a number value.

## Examples

### Using NEGATIVE_INFINITY

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

```js
let smallNumber = -Number.MAX_VALUE * 2;

if (smallNumber === Number.NEGATIVE_INFINITY) {
  smallNumber = returnFinite();
}