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JavaScript parseFloat() Function
JavaScript Global Functions
Definition and Usage
The parseFloat() function parses a string and returns a floating point number.
This function determines if the first character in the specified string is a number. If it is, it parses the string until it reaches the end of the number, and returns the number as a number, not as a string.
Syntax
parseFloat(string)
| Parameter | Description |
|---|---|
| string | Required. The string to be parsed |
Browser Support
The parseFloat() function is supported in all major browsers.
Tips and Notes
Note: Only the first number in the string is returned!
Note: Leading and trailing spaces are allowed.
Note: If the first character cannot be converted to a number, parseFloat() returns NaN.
Example
Example
Parse different strings:
<script type="text/javascript">
document.write(parseFloat("10") + "<br />");
document.write(parseFloat("10.33") + "<br />");
document.write(parseFloat("34 45 66") + "<br />");
document.write(parseFloat(" 60 ") + "<br />");
document.write(parseFloat("40 years") + "<br />");
document.write(parseFloat("He was 40") + "<br />");
</script>
document.write(parseFloat("10") + "<br />");
document.write(parseFloat("10.33") + "<br />");
document.write(parseFloat("34 45 66") + "<br />");
document.write(parseFloat(" 60 ") + "<br />");
document.write(parseFloat("40 years") + "<br />");
document.write(parseFloat("He was 40") + "<br />");
</script>
The output of the code above will be:
10
10.33
34
60
40
NaN
10.33
34
60
40
NaN
Try it yourself »
JavaScript Global Functions
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Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content.
While using this site, you agree to have read and accepted our terms of use and privacy policy.
Copyright 1999-2012 by Refsnes Data. All Rights Reserved.
Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content.
While using this site, you agree to have read and accepted our terms of use and privacy policy.
Copyright 1999-2012 by Refsnes Data. All Rights Reserved.