vb.net code 128 barcode EXERCISE 2-9: Creating a For Loop in Java

Create UPCA in Java EXERCISE 2-9: Creating a For Loop

EXERCISE 2-9: Creating a For Loop
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In this exercise, you will create a simple for loop to see a loop in action
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2 Change the name of Layer 1 to actions 3 Select the first keyframe of the actions layer and open the Actions panel 4 In the Scripting pane, create a loop that runs 10 times by typing this code:
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for(var i:Number = 0; i < 10; i++) { }
5 Inside the curly braces of the loop, trace the value of i Your code should
match what is shown here:
for(var i:Number = 0; i < 10; i++) { trace(i); }
6 Test the movie Notice the values that appear in the Output window,
shown in the illustration, are 0 through 9
7 Close the file You do not need to save your changes
In the next section, I will discuss arrays, and how to use a loop to capture data from an array
C H A P T E R
NDERSTANDING ARRAYS
Arrays are a little different than anything you ve worked with up to this point, and you ll use them often when creating games Earlier in this chapter, I discussed how variables are containers that hold data Arrays are containers that can hold multiple data values
Creating an Array
The Array data type is also called a class A class refers to the behavior of an object You already have experience working with classes Classes are similar to symbols When you create an instance of a movie clip, you are actually creating an instance of the MovieClip class To create an instance of a class that is not visible, like the Array class, you type the keyword new, a space, and the name of the class followed by parentheses Once you create an instance of the Array class, you can access its properties and methods in the same way you access the properties and methods of a movie clip The following code shows an example of creating a new instance of the Array class called my_ary
var my_ary:Array = new Array();
As discussed earlier, arrays hold multiple data values The values of an array are stored in numerical order Items in an array can be referenced by their numerical position, which in an array is called an index number The first index of an array is always zero, and array indices are always referenced using square brackets ([])
Adding to an Array
There are a few different ways to add data to an array One way is to set the value of a particular index of an array The following code demonstrates the data Some text being added to an array called my_ary at index 0, and the data Some more text added to the array at index 1
var my_ary:Array = new Array(); my_ary[0] = "Some text"; my_ary[1] = "Some more text";
Data inside an array is not limited to strings In fact, arrays can hold any type of data, and even different types of data You can also create an array and add data to it using one line of code To do this, instead of using the new keyword to create an array, you type square brackets and the values of the array, separated by commas The following code demonstrates some
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numeric values being added to an array called my_ary on the same line the array is created
var my_ary:Array = [7,3,15,6,12];
Another way to add data to an array is to use the push method of the Array class The push method adds an item to the last index of an array If the array has no indices, the data is placed at index zero The following code shows the push method adding the data Pushed text to an array instance called my_ary at index zero
var my_ary:Array = new Array(); my_arypush("Pushed text");
Capturing Data from an Array
There are several different ways to capture data from an array One way is to reference the data by its index in the array The code that follows demonstrates tracing data at index one of an array called my_ary
var my_ary:Array = [7,3,15,6,12]; trace(my_ary[1]); // Traced value is 3
In this code, the value in the Output window would show 3, because the first value in the array, which is 7 in this case, is at index zero Another helpful tool for working with arrays is the length property The length property of an array gives you the number of items in the array (not the last index number) You can then use this information in a code loop (or a for loop) to use the data in each index of an array, which you will do often when you create games The following code shows a loop that runs for each index of the array my_ary and traces the value of each index
var my_ary:Array = [7,3,15,6,12]; for(var i:Number = 0; i < my_arylength; i++) { trace(my_ary[i]); } // The Output window would then show each of the values in the array
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