ActionScript 2.0 Language Reference - Adobe Help and Support

Parameters
message:String [optional] - A string associated with the Error object.
Example
In the following example, a function throws an error (with a specified message) if the two
strings that are passed to it are not identical:
function compareStrings(str1_str:String, str2_str:String):Void {
if (str1_str != str2_str) {
throw new Error("Strings do not match.");
}
}
try {
compareStrings("Dog", "dog");
// output: Strings do not match.
} catch (e_err:Error) {
trace(e_err.toString());
}
See also
throw statement, try..catch..finally statement
message (Error.message property)
public message : String
Contains the message associated with the Error object. By default, the value of this property is
"Error". You can specify a message property when you create an Error object by passing the
error string to the Error constructor function.
Availability: ActionScript 1.0; Flash Player 7
Example
In the following example, a function throws a specified message depending on the parameters
entered into theNum. If two numbers can be divided, SUCCESS and the number are shown.
Specific errors are shown if you try to divide by 0 or enter only 1 parameter:
function divideNum(num1:Number, num2:Number):Number {
if (isNaN(num1) || isNaN(num2)) {
throw new Error("divideNum function requires two numeric parameters.");
} else if (num2 == 0) {
throw new Error("cannot divide by zero.");
}
return num1/num2;
554 ActionScript classes