Adobe Flex 2 - Programming ActionScript 3.0

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Example text

71 Operators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 Conditionals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 Looping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 language—they are its fundamental building blocks.

88 Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 language—they are its fundamental building blocks. Every variable you declare, every function you write, and every class instance you create is an object. 0 program as a group of objects that carry out tasks, respond to events, and communicate with one another. 35 Programmers familiar with object-oriented programming (OOP) in Java or C++ may think of objects as modules that contain two kinds of members: data stored in member variables or properties, and behavior accessible through methods.

This restriction of scope is called block-level scope, and does not exist in ActionScript. If you declare a variable inside a block of code, that variable will be available not only in that block of code, but also in any other parts of the function to which the code block belongs. For example, the following function contains variables that are defined in various block scopes. All the variables are available throughout the function. length; if (numElements > 0) { var elemStr:String = "Element #"; for (var i:int = 0; i < numElements; i++) { var valueStr:String = i + ": " + testArray[i]; trace (elemStr + valueStr); } trace (elemStr, valueStr, i); // all still defined } trace (elemStr, valueStr, i); // all defined if numElements > 0 } blockTest(["Earth", "Moon", "Sun"]); An interesting implication of the lack of block-level scope is that you can read or write to a variable before it is declared, as long as it is declared before the function ends.

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