JavaScript Number isInteger()
Examples
Are these integers?
Number.isInteger(123);
Number.isInteger(-123);
Number.isInteger('123');
Try it Yourself »
Number.isInteger(4-2);
Number.isInteger(4/2);
Number.isInteger(5-2);
Number.isInteger(5/2);
Try it Yourself »
More examples below
Definition and Usage
The Number.isInteger() method returns
true if a value is an integer of the datatype Number.
Otherwise it returns false.
Syntax
Number.isInteger(value)
Parameters
| Parameter | Description |
| value | Required. The value to be tested. |
Return Value
| Type | Description |
| A boolean | true if the value is an integer of the datatype Number.Otherwise false. |
More Examples
Are these integers?
Number.isInteger(0);
Number.isInteger(0/0);
Number.isInteger(0.5);
Number.isInteger(false);
Number.isInteger(NaN);
Number.isInteger(Infinity);
Number.isInteger(-Infinity);
Try it Yourself »
Browser Support
Number.isInteger() is an ECMAScript6 (ES6) feature.
ES6 (JavaScript 2015) is supported in all modern browsers:
| Chrome | Edge | Firefox | Safari | Opera |
| Yes | Yes | Yes | Yes | Yes |
Number.isInteger() is not supported in Internet Explorer 11 (or earlier).
