ActionScript 2.0 Language Reference 
ActionScript 2.0 Language Reference |
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| ActionScript language elements > Global Functions > parseFloat function | |||
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parseFloat(string:String) : Number
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.
Availability: ActionScript 1.0; Flash Player 5
string:String - The string to read and convert to a floating-point number.
Number - A number or NaN (not a number).
The following examples use the parseFloat() function to evaluate various types of numbers:
trace(parseFloat("-2")); // -2
trace(parseFloat("2.5")); // 2.5
trace(parseFloat(" 2.5")); // 2.5
trace(parseFloat("3.5e6")); // 3500000
trace(parseFloat("foobar")); // NaN
trace(parseFloat("3.75math")); // 3.75
trace(parseFloat("0garbage")); // 0
NaN constant, parseInt function
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