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The Number.isInteger()
method determines whether the passed value is an integer.
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 infinite, return false
.
Examples
Number.isInteger(0); // true Number.isInteger(1); // true Number.isInteger(-100000); // true Number.isInteger(0.1); // false Number.isInteger(Math.PI); // 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
Polyfill
Number.isInteger = Number.isInteger || function(value) { return typeof value === "number" && isFinite(value) && Math.floor(value) === value; };
Specifications
Specification | Status | Comment |
---|---|---|
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Number.isInteger' in that specification. |
Standard | Initial definition. |
ECMAScript 2017 Draft (ECMA-262) The definition of 'Number.isInteger' in that specification. |
Draft |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | (Yes) | 16 (16) | No support | (Yes) | No support |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | No support | No support | 16.0 (16) | No support | No support | No support |
See also
- The
Number
object it belongs to.
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