The Constructor Property
Every time an instance is made, it receives not only what properties you define for it, but also, it automatically gets defined for it another hidden property called constructor. As its name implies, it represents the constructor function used to create that instance. Every instance of a class, no matter if its an instance of Fish, an array or even a movieclip, has a constructor property which references the constructor function used to make that instance (or at least the constructor function associated with the instance as movieclips aren't technically created exclusively with the MovieClip constructor). See the following example.

Folder = function(contents){

this.contents = contents;

};

 

myDocuments = new Folder("untitled.fla");

trace(myDocuments.constructor == Folder); // traces true

myPictures = new myDocuments.constructor("clipboard.bmp");

trace(myPictures.constructor == Folder); // traces true

Since myDocuments is a Folder instance, its constructor property references the Folder constructor function. With that, as you can see, it can even be used to create another instance of its same type. The myPictures object was done in such a manner.

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