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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, the string is parsed until the end of the number is reached, and the number is returned as a number, not as a string.

Syntax

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: Leading and trailing spaces are allowed.

Note: If the first character of the string cannot be converted to a number, parseFloat() returns NaN.


Examples

Using 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 above example outputs:

10
10.33
34
60
40
NaN

JavaScript Global Functions

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