Removing Properties in Java

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Removing Properties
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You can use the delete operator to remove key-value pairs from an associative array. Apply the delete operator before the value (expressed the same way as you would look it up), and both the key and its associated value will be removed from the associative array:
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var pastas:Object = {tortellini: 2, gemelli: 14, spaghetti: 9}; trace(pastas["spaghetti"]); //9 delete pastas["spaghetti"]; trace(pastas["spaghetti"]); //undefined
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The delete operator also works on dynamically added properties and methods of instances of dynamic classes.
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The delete operator returns true if deletion succeeds. When using delete on a numerically indexed item in an Array, the length property is not updated. You cannot delete instance properties that are not dynamic, or local variables. To release objects, you can remove all references to them, such as by setting variables to null.
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Part II: Core ActionScript 3.0 Data Types
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Iterating
You can iterate through the key-value pairs of an associative array whether it be an Array, Object, or Dictionary with the for..in and for each..in loops introduced in 2, ActionScript 3.0 Language Basics. Use the for..in loop when you need access to the keys, and use the for each..in loop when you are interested in the values only, as shown in Example 10-4.
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EXAMPLE 10-4
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http://actionscriptbible.com/ch10/ex4
Iterating Associative Arrays
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package { import com.actionscriptbible.Example; public class ch10ex4 extends Example { public function ch10ex4() { var characters:Object = {Roger: "The Author", Kumo: "The Cat"}; trace("Roger" in characters); //true trace("Bailey" in characters); //false //iterate through the values for each (var value:String in characters) { trace("I see", value); } //iterate through the keys for (var key:String in characters) { trace(key, "is", characters[key]); } } } }
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As you learned in 3, Methods and Functions, ActionScript 3.0 gives you added exibility when passing parameters to functions. You can leave out arguments with default values, and you can accept variable-length argument lists with the ...rest parameter. Every so often it might be necessary for a function to accept more than a handful of possible arguments, in which case identifying the argument s intention from its position in the argument list alone can be a memory exercise. For example, the following code sets a particular line style in preparation to draw some strokes on a
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Sprite:
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var sprite:Sprite = new Sprite(); var g:Graphics = sprite.graphics;
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10: Objects and Dictionaries
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g.lineStyle(1, 0xff0000, 1, true, "none", "round", "round", 20); g.lineStyle(1, 0xff0000, 1, true, LineScaleMode.NONE, CapsStyle.ROUND, JointStyle.ROUND, 20);
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The last two lines do the same thing. The function call is almost incomprehensible when you use plain strings for the three parameters near the end. When you use the static constants for these variables, the readability improves some. In these cases, when the number of parameters to the function is not the result of a design aw, you might wish you could use named arguments. Well, tough cookies, ActionScript 3.0 doesn t use named arguments, but you could accept an Object argument that stores multiple values which would otherwise be arguments. These values are accessible by named keys, almost like named arguments! Because you can t check the passed Object at compile time for correctness, it s best to only use an Object for named arguments that have defaults, so that if someone passes an Object in with a missing or invalid property, which isn t checked by the compiler, you can assign it the appropriate default value for that parameter. Let s go back to the example and pretend instead that you rewrote the lineStyle() function to take an Object parameter. The call might look very different:
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g.lineStyle({ thickness: 1, color: 0xff0000, alpha: 1, pixelHinting: true, scaleMode: LineScaleMode.NONE, caps: CapsStyle.ROUND, joints: JointStyle.ROUND, miterLimit: 20 });
This use of a one-time, or anonymous, object to name parameters can increase readability of your code, but at the cost of compile-time argument checking. I recommend that you use this approach sparingly.