&& operation in actionscript -

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"bitmap" is zero in the following code, even if it is why? 

  Get BitmapHight () for Public Function (if (_bitmapHeight == 0 & amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; Amp; tap = null) _bitmapHeight = BITMAP.bitmapData.height; return_bitemap; P> If the BITMAP is empty then that line of code should never be done.  
 Try this:  
  get a bitmap (public) function (if (_bitmapHeight = = 0 & amp; amp; amp; amp; amp; amp; null; = null) {trace ("null with called"); _bitmapHeight = BITMAP.bitmapData.height;} PS _bitmapHeight;}  
 
 What does 'called redundant' ever know?

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