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ActionScript 20 Essentials
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Trace statement showing up in the Output window
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trace myName and the value of the variable would show up in the Output window (see Figure 2-8) Some functions have multiple parameters If a custom or prebuilt function has multiple parameters, the values are all passed in the parentheses when you run the function, and they are separated by commas
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Creating Functions with Parameters
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Making functions that accept parameters is only a little more complex than making functions that do not accept parameters To make a function accept parameters, you need to do two things: create the parameters when you define the function, and pass in the parameters when you run the function
C H A P T E R
FIGURE 2-8
Tracing the value of a variable
Creating parameters inside a function is similar to declaring variables without giving them values The only difference is that you declare the variables inside of the parentheses of the function declaration, separated by commas instead of semicolons If you had a function called myFunction, and you wanted the function to accept a parameter called myParam, that had a data type of String, you would type
function myFunction(myParam:String):Void { }
Once you have defined a function that accepts parameters, you need to pass in parameters when you run the function The parameters you pass in must have the same data type you specified when you defined the function For example, if you wanted to run the function defined in the code in the last paragraph, you would type
myFunction("Any value will work, as long as it is a String!");
Notice the value passed in is a string (you can tell because it s in quotes) Why does it have to be a string It has to be a string because the function is looking for a string to give a value to the myParam parameter Take a minute to look over the code and think about how it works
ActionScript 20 Essentials
NINTENDO
FLASH
GAME
CREATOR S
GUIDE
EXERCISE 2-5: Writing and Using Functions with Parameters
In this exercise, you will get some practice creating functions that accept parameters
1 Open the file you worked with in the last exercise 2 Select the first keyframe of the actions layer and open the Actions panel 3 Inside the parentheses of the setValues function you declared at the top of
the code, create a parameter called xPosition with a Number data type
4 Inside the curly braces of the setValues function, find the line where you set
the _x property of rect_mc to 10 (shown in the following illustration), and replace the 10 with xPosition
At this point, the xPosition parameter does not have a value The value of the parameter will be whatever value you pass in when you run the setValues function
C H A P T E R
5 At the bottom of the code, find the line where you run the setValues
function Inside the parentheses, type 50, as shown next The number that you type here will be the X position of the rect_mc movie clip when you preview the movie
6 Test the movie Notice the rect_mc movie clip is 50 pixels from the left
edge of the Stage, just as you passed in when you ran the setValues function Nice!
7 Close the preview window, and change the value passed into the setValues
function Take a minute to review how the code is working, and test the movie again
8 When you are finished, close the file You do not need to save your changes
Understanding Return Values
Some functions give values back after they run This is called returning a value The Math class, or Math object, has many properties and methods that perform various mathematical operations Many of the Math methods are functions that return values One example of a function that returns a value is the Mathrandom method This function is attached to the Math object, so it is called a method instead of a function The Mathrandom method gives you a random number between 0 and 1, but not including 1 You would see a random decimal number in the Output window if you typed this code and tested the movie:
trace(Mathrandom());
Notice this line of code ends with two closing parentheses The first one is for the Mathrandom method, and the second is to close the trace statement
ActionScript 20 Essentials
NINTENDO
FLASH
GAME
CREATOR S
GUIDE
When the Mathrandom method runs, Flash does some work behind the scenes and returns a number Once you start creating games, you will use and create many different functions that return values
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