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

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.POSITIVE_INFINITY' in that specification.
Standard
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Number.POSITIVE_INFINITY' in that specification.
Standard
ECMAScript Latest Draft (ECMA-262)
The definition of 'Number.POSITIVE_INFINITY' in that specification.
Draft

Browser compatibility

Update compatibility data on GitHub
Desktop Mobile Server Chrome Edge Firefox Internet Explorer Opera Safari Android webview Chrome for Android Firefox for Android Opera for Android Chrome Full support Yes Edge Full support Yes Firefox Full support 1 IE Full support Yes Opera Full support Yes Safari Full support Yes WebView Android Full support Yes Chrome Android Full support Yes Firefox Android Full support 4 Opera Android Full support Yes Safari iOS Full support Yes Samsung Internet Android Full support Yes nodejs Full support Yes

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