Actionscript:
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const RADIUS = 10;
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const COLOR = 0xCCCCCC;
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function createCircle(xp:Number, yp:Number, radius:Number = RADIUS, col:uint = COLOR):void{
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var c:Sprite = new Sprite();
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c.graphics.beginFill(col);
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c.graphics.drawCircle(xp, yp, radius);
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addChild(c);
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}
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// optional last 2 values are populated with const defaults
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createCircle(100,100);
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// optional color value is populated with default 0xCCCCCC;
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createCircle(200,100, 20);
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//
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createCircle(300,100, 50,0x0000FF);