With multidimensional arrays, concat( ) or slice( ) only duplicates the top level of the array

 

package{
  import flash.display.Sprite;
  
  public class Main extends Sprite{
    public function Main(){

        var coordinates:Array = new Array(  );
        coordinates.push([0,1,2,3]);
        coordinates.push([4,5,6,7]);
        coordinates.push([8,9,10,11]);
        coordinates.push([12,13,14,15]);
        
        var coordinatesDuplicate:Array = coordinates.concat(  );
        
        coordinatesDuplicate[0][0] = 20;
        trace(coordinates[0][0]);  // Displays: 20
        
        coordinatesDuplicate[1] = [21,22,23,24];
        trace(coordinates[1]);  // Displays: 4,5,6,7
        
    }
  }
}
20
4,5,6,7

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5.	Working with Multidimensional Arrays
6.	Storing Complex or Multidimensional Data
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9.	You can specify the properties of the object in any order you like
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12.	Compose dynamic properties
13.	Two ways to add properties to dynamic object
14.	Reading Elements of an Associative Array

With multidimensional arrays, concat( ) or slice( ) only duplicates the top level of the array : Array Dimension « Array « Flash / Flex / ActionScript

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