1180: Call to a possibly undefined method FlipUntilHead - actionscript-3

Question

package {
import flash.display.MovieClip;
import flash.text.TextField;
import flash.text.TextFieldType;
import flash.events.MouseEvent;
public class coinFlip extends MovieClip {// class
var bool:Boolean;
var num1:Number;
var counter:int;
public function coinFlip() {// constructor
RandomTruth();
var textF1:TextField = new TextField();
FlipUntilHead(RandomTruth); // the error is right here*
if (bool == false) {
textF1.text = "tails";
} else {
textF1.text = "heads";
}
addChild(textF1);
function RandomTruth() {
num1 = Math.random();
//trace(num1);
if (num1 < 0.5) {
bool = false;
return;
} else {
bool = true;
return;
}
function FlipUntilHead(RandomTruth) {
while (bool == false) {
RandomTruth();
counter ++;
return
}
//trace(counter);
}
}
}// end of constructor
}// end of class
}// end of package (program)
The program is supposed to "flip" a coin until it lands on heads using Math.random and boolean variables to declare if its "heads" or "tails".
I think it might be a very simple error and I am just dumb (beginner in programming).
The error is:
"1180: Call to a possibly undefined method FlipUntilHead"

Answer 1

Problem 1: You do not have to pass any parameters into your FlipUntilHead() function, because that function already calls RandomTruth().
Instead of function FlipUntilHead(RandomTruth) use function FlipUntilHead().
Then, instead of
RandomTruth();
var textF1:TextField = new TextField();
FlipUntilHead(RandomTruth);
use
var textF1:TextField = new TextField();
FlipUntilHead();
Although the function name indeed existed, the error was being thrown because it didn't understand the way that you were passing RandomTruth into it.
Problem 2: Also, there should be a } just before function FlipUntilHead(){, and one less } at the end of your program.
Problem 3: Finally, the while loop within FlipUntilHead() is not looping properly, because there is a return statement that immediately ends the function at the first loop. Here is the final code:
package {
import flash.display.MovieClip;
import flash.text.TextField;
import flash.text.TextFieldType;
import flash.events.MouseEvent;
public class coinFlip extends MovieClip {
var bool:Boolean;
var num1:Number;
var counter:int;
public function coinFlip() {
var textF1:TextField = new TextField();
FlipUntilHead();
if (bool == false) {
textF1.text = "tails";
} else {
textF1.text = "heads";
}
addChild(textF1);
function RandomTruth() {
num1 = Math.random();
if (num1 < 0.5) {
bool = false;
return;
} else {
bool = true;
return;
}
}
function FlipUntilHead() {
while (bool == false) {
RandomTruth();
counter++;
}
}
}
}
}