javascript - Why do some angular $scope functions "return" an operation? -

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I've got some code that looks like this: 

  $ scope.open = Function ($ event) {$ event.preventDefault (); $ Event.stopPropagation (); Return Scope Open = true; };   
 Why is this returning an assignment? What does it do? Is there any advantage of doing this or not?   
 
 
 This is basically:  
  $ scope.open = Function ($ event) {$ event.preventDefault (); $ Event.stopPropagation (); $ Scope Open = true; Return Scope };   
 The advantage is that it saves a line of code, probably not worth it.  
 This can also be compiled with a cryptographic code, which was originally viewed:  
  $ scope.open = ($ event) - & gt; $ Event.preventDefault () $ event.stopPropagation () $ scope.opened = true   
 The coffee script always gives the result of the last line in a method, so it can return a value from those tasks You will normally expect nothing to happen again.

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