JavaScript Number.isInteger()Method
JavaScript Number ObjectExample
Detect whether the parameter is an integer:
Number.isInteger(123);
Number.isInteger(-123);
Number.isInteger('123');
Number.isInteger(4-2);
Number.isInteger(4/2);
Number.isInteger(5-2);
Number.isInteger(5/2);
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Definition and Usage
The isInteger() function is used to detect whether the specified parameter is an integer. If it is an integer, it returns true; otherwise, it returns false.
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
Browser Support
Number.isInteger() is a new feature of ECMAScript 6 (ES6).
Basically, the latest browser versions all support ES6 (JavaScript 2015).
Number.isInteger() is not supported in Internet Explorer 11 and earlier versions of browsers.
| Chrome | Edge | Firefox | Safari | Opera |
| Yes | Yes | Yes | Yes | Yes |
Syntax
Number.isInteger(value)
Parameter Values
| Parameter | Description |
|---|---|
| value | The value to be detected. |
Return Value
| Type | Description |
|---|---|
| Boolean | Returns true if it is an integer, otherwise returns false. |
Technical Details
| JavaScript Version: | ECMAScript 6 |
|---|
More Examples
Example
Detect whether the parameter is an integer:
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 »