JavaScript Number.isInteger() Method

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JavaScript Number.isInteger() Method

The Number.isInteger() method returns a Boolean value indicates whether the passed value is an integer.


HTML Online Editor
<!DOCTYPE html> <html> <body> <script> var result = Number.isInteger(1.5); document.write(result); </script> </body> </html>



Parameter Values

valueRequiredThe value to be tested for being an integer.

Return Value

trueIf the given value is integer.
falseIf the given value is not an integer.

More Examples


HTML Online Editor
<!DOCTYPE html> <html> <body> <script> document.write(Number.isInteger(0) +": 0 <br>"); document.write(Number.isInteger(1) +": 1 <br>"); document.write(Number.isInteger(-25) +": -25 <br>"); document.write(Number.isInteger(99999999999) +": 99999999999 <br><br>"); document.write(Number.isInteger(true) +": true <br>"); document.write(Number.isInteger(false) +": false <br>"); document.write(Number.isInteger('65') +": '65' <br>"); document.write(Number.isInteger(1.5) +": 1.5 <br>"); document.write(Number.isInteger([5]) +": [5] <br>"); document.write(Number.isInteger(NaN) +": NaN <br>"); document.write(Number.isInteger(Infinity) +": Infinity <br>"); document.write(Number.isInteger(-Infinity) +": -Infinity <br>"); document.write(Number.isInteger(null) +": null <br>"); </script> </body> </html>


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