JavaScript Number.isNaN() Method
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JavaScript Number.isNaN() Method
The Number.isNaN() method returns a Boolean value indicates whether the passed value is NaN and its type is Number.
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<script>
var result = Number.isNaN("Hello");
document.write(result);
</script>
</body>
</html>
Syntax
Number.isNaN(value)
Parameter Values
| Value | Type | Explanation |
|---|---|---|
| value | Required | The value to be tested for Not-a-Number (NaN). |
Return Value
| Value | Explanation |
|---|---|
| true | If the given value is NaN and its type is Number. |
| false | If the given value is not a NaN. |
More Examples
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<script>
document.write(Number.isNaN(NaN)+" :NaN <br>");
document.write(Number.isNaN(0 / 0)+" :0 / 0 <br><br>");
document.write(Number.isNaN(25)+" :25 <br>");
document.write(Number.isNaN(-25.5)+" :-25.5 <br>");
document.write(Number.isNaN(true)+" :true <br>");
document.write(Number.isNaN(false)+" :false <br>");
document.write(Number.isNaN('65')+" :'65' <br>");
document.write(Number.isNaN([5])+" :[5] <br>");
document.write(Number.isNaN(Infinity)+" :Infinity <br>");
document.write(Number.isNaN(-Infinity)+" :-Infinity <br>");
document.write(Number.isNaN(null)+" :null <br>");
</script>
</body>
</html>
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