JavaScript parseFloat()Function
JavaScript Global FunctionsDefinition and Usage
The parseFloat() function parses a string and returns a floating-point number.
This function determines whether the first character in the string is a number. If so, it parses the string until it reaches the end of the number, then returns the number as a number, not as a string.
Syntax
parseFloat(string)
| Parameter | Description |
|---|---|
| string | Required. The string to be parsed. |
Browser Support
All major browsers support the parseFloat() function.
Tips and Notes
Note:Only the first number in the string is returned.
Note:Spaces at the beginning and end are allowed.
Note:If the first character of the string cannot be converted to a number, parseFloat() returns NaN.
Examples
Examples
Use parseFloat() to parse different strings:
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>");
The output of the above example is:
10
10.33
34
60
40
NaN
10.33
34
60
40
NaN
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