javascript named function expressions – scope accessibility [duplicate]

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In his book, The Secrets of the JavaScript Ninja, John Resig makes a wonderful explanation about this concept.

http://jsninja.com/

Below are the quotes from the book:

4.2.4. Inline named functions

 <script type="text/javascript">
  var ninja = function myNinja(){ 
      assert(ninja == myNinja, "this is named two things at once!"); 
  };
  ninja(); 
  assert(typeof myNinja == "undefined",
    "But myNinja isn't defined outside of the function."); 
 </script>

This listing brings up the most important point regarding inline
functions: even though inline functions can be named, those names are
only visible within the functions themselves.

Remember the scoping rules we talked about back in chapter 3? Inline
function names act somewhat like variable names, and their scope is
limited to the function within which they’re declared.

3.2.1. Scoping and functions

Variable declarations are in scope from their point of declaration to
the end of the function within which they’re declared, regardless of
block nesting.

If you would like to know more about this concept, this book will help you.

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