Syntax
parseFloat(string)
Parameters
string | A string that represents the value you want to parse. |
Description
The parseFloat function is a built-in JavaScript function.
parseFloat parses its argument, a string, and returns a floating point number. If it encounters a character other than a sign (+ or -), numeral (0-9), a decimal point, or an exponent, then it returns the value up to that point and ignores that character and all succeeding characters.
If the first character cannot be converted to a number, parseFloat returns "NaN".
For arithmetic purposes, the "NaN" value is not a number in any radix. You can call the isNaN function to determine if the result of parseFloat is "NaN". If "NaN" is passed on to arithmetic operations, the operation results will also be "NaN".
Examples
The following examples all return 3.14:
parseFloat("3.14")
The following example returns
parseFloat("314e-2")
parseFloat("0.0314E+2")
var x = "3.14"
parseFloat(x)"NaN":
parseFloat("FF2")
See also
isNaN, parseInt
Last Updated: 10/31/97 16:38:00