Example
Check whether a value is an integer:
Number.isInteger(123) //true
Number.isInteger(-123) //true
Number.isInteger(5-2)
//true
Number.isInteger(0) //true
Number.isInteger(0.5) //false
Number.isInteger('123') //false
Number.isInteger(false) //false
Number.isInteger(Infinity)
//false
Number.isInteger(-Infinity) //false
Number.isInteger(0 / 0)
//false
Try it Yourself »
Definition and Usage
The Number.isInteger() method determines whether a value an integer.
This method returns true if the value is of the type Number, and an integer (a whole number). Otherwise it returns false.
Browser Support
| Method | |||||
|---|---|---|---|---|---|
| Number.isInteger() | 19 | 12.0 | 16 | 9 | 22 |
Note: The Number.isInteger() method is not supported in Internet Explorer 11 and earlier versions.
Syntax
Number.isInteger(value)
Parameter Values
| Parameter | Description |
|---|---|
| value | Required. The value to be tested |
Technical Details
| Return Value: | A Boolean. Returns true if the value is an integer Number, otherwise it returns false |
|---|---|
| JavaScript Version: | ECMAScript 6 |
< JavaScript Number Reference