Number.NEGATIVE_INFINITY

The Number.NEGATIVE_INFINITY property represents the negative Infinity value.

You do not have to create a Number object to access this static property (use Number.NEGATIVE_INFINITY).

Property attributes of Number.NEGATIVE_INFINITY
Writable no
Enumerable no
Configurable no

Description

The value of Number.NEGATIVE_INFINITY is the same as the negative value of the global object's Infinity property.

This value behaves slightly differently than mathematical infinity:

• Any positive value, including POSITIVE_INFINITY, multiplied by NEGATIVE_INFINITY is NEGATIVE_INFINITY.
• Any negative value, including NEGATIVE_INFINITY, multiplied by NEGATIVE_INFINITY is POSITIVE_INFINITY.
• Zero multiplied by NEGATIVE_INFINITY is NaN.
• NaN multiplied by NEGATIVE_INFINITY is NaN.
• NEGATIVE_INFINITY, divided by any negative value except NEGATIVE_INFINITY, is POSITIVE_INFINITY.
• NEGATIVE_INFINITY, divided by any positive value except POSITIVE_INFINITY, is NEGATIVE_INFINITY.
• NEGATIVE_INFINITY, divided by either NEGATIVE_INFINITY or POSITIVE_INFINITY, is NaN.
• Any number divided by NEGATIVE_INFINITY is zero.

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 isFinite would be more appropriate in such a case.

Examples

Using NEGATIVE_INFINITY

In the following example, the variable smallNumber is assigned a value that is smaller than the minimum value. When the if statement executes, smallNumber has the value -Infinity, so smallNumber is set to a more manageable value before continuing.

JavaScript
var smallNumber = (-Number.MAX_VALUE) * 2;

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

Specifications

Specification Status Comment
ECMAScript 1st Edition (ECMA-262) Standard Initial definition. Implemented in JavaScript 1.1.
ECMAScript 5.1 (ECMA-262)
The definition of 'Number.NEGATIVE_INFINITY' in that specification.
Standard
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Number.NEGATIVE_INFINITY' in that specification.
Standard
ECMAScript 2017 Draft (ECMA-262)
The definition of 'Number.NEGATIVE_INFINITY' in that specification.
Draft

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) (Yes) (Yes) (Yes) (Yes)
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)