The Number.isInteger()
method determines whether the passed value is an integer.
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Syntax
Number.isInteger(value)
Parameters
value
- The value to be tested for being an integer.
Return value
A Boolean
indicating whether or not the given value is an integer.
Description
If the target value is an integer, return true
, otherwise return false
. If the value is NaN
or Infinity
, return false
. The method will also return true
for floating point numbers that can be represented as integer.
Polyfill
Number.isInteger = Number.isInteger || function(value) { return typeof value === 'number' && isFinite(value) && Math.floor(value) === value; };
Examples
Using isInteger
Number.isInteger(0); // true Number.isInteger(1); // true Number.isInteger(-100000); // true Number.isInteger(99999999999999999999999); // true Number.isInteger(0.1); // false Number.isInteger(Math.PI); // false Number.isInteger(NaN); // false Number.isInteger(Infinity); // false Number.isInteger(-Infinity); // false Number.isInteger('10'); // false Number.isInteger(true); // false Number.isInteger(false); // false Number.isInteger([1]); // false Number.isInteger(5.0); // true Number.isInteger(5.000000000000001); // false Number.isInteger(5.0000000000000001); // true
Specifications
Specification |
---|
ECMAScript (ECMA-262) The definition of 'Number.isInteger' in that specification. |
Browser compatibility
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | Server | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
isInteger | Chrome Full support 34 | Edge Full support 12 | Firefox Full support 16 | IE No support No | Opera Full support 21 | Safari Full support 9 | WebView Android Full support ≤37 | Chrome Android Full support 34 | Firefox Android Full support 16 | Opera Android Full support 21 | Safari iOS Full support 9 | Samsung Internet Android Full support 2.0 | nodejs Full support 0.12 |
Legend
- Full support
- Full support
- No support
- No support
See also
- The
Number
object it belongs to.