MACROMEDIA FLEX-FLEX ACTIONSCRIPT LANGUAGE, Reference

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192 Chapter 5: ActionScript Core Language Elements
parseFloat()
Availability
Flash Player 5.
Usage
parseFloat( string:String ) : Number
Parameters
string
The string to read and convert to a floating-point number.
Returns
A number or
NaN
(not a number).
Description
Function; converts a string to a floating-point number. The function reads, or parses , and returns
the numbers in a string until it reaches a character that is not a part of the initial number. If the
string does not begin with a number that can be parsed,
parseFloat()
returns
NaN
. White space
preceding valid integers is ignored, as are trailing nonnumeric characters.
Example
The following examples use the
parseFloat()
function to evaluate various types of numbers:
trace(parseFloat("-2")); // output: -2
trace(parseFloat("2.5")); // output: 2.5
trace(parseFloat(" 2.5")); // output: 2.5
trace(parseFloat("3.5e6")); // output: 3500000
trace(parseFloat("foobar")); // output: NaN
trace(parseFloat("3.75math")); // output: 3.75
trace(parseFloat("0garbage")); // output: 0
See also
NaN , parseInt()
CHAPTER 5
ActionScript Core Language Elements