JavaScript parseFloat() Function
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 |
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
In this example we will use parseFloat() to parse different strings:<script type="text/javascript"> document.write(parseFloat("10") + "<br />");
document.write(parseFloat("10.00") + "<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 10.33 34 60 40 NaN |
JavaScript parseFloat() Function
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