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map vs

Question asked by pthibault on Aug 20, 2012
Latest reply on Aug 20, 2012 by DSwingley-esristaff
In the new print widget the examples show the map being defined as:
var app = {}; = null, = new esri.Map("map", {
          extent: initialExtent,
          wrapAround180: true

this is compared to just :
map = new esri.Map.........

Can some please explain what is happening with the variable "app"?