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Number.POSITIVE_INFINITY

The Number.POSITIVE_INFINITY property represents the positive Infinity value.

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

Description

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

This value behaves slightly differently than mathematical infinity:

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

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 isFinite would be more appropriate in such a case.

Because POSITIVE_INFINITY is a static property of Number, you always use it as Number.POSITIVE_INFINITY, rather than as a property of a Number object you created.

Examples

Using POSITIVE_INFINITY

In the following example, the variable bigNumber is assigned a value that is larger than the maximum value. When the if statement executes, bigNumber has the value Infinity, so bigNumber is set to a more manageable value before continuing.

var bigNumber = Number.MAX_VALUE * 2;

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

Specifications

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
POSITIVE_INFINITY 1 12 1 4 3 1
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
POSITIVE_INFINITY 1 18 4 10.1 1 1.0
Server
Node.js
POSITIVE_INFINITY 0.1.100

See also

© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://wiki.developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/POSITIVE_INFINITY