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// a self-invoking anonymous function
(function() {})();
Is it the same as the following?
// as in underscore.js (underscorejs.org)
(function() {}).call(this);
No, the second one will set the calling context of the function to the same value as the outer context.
The first one may or may not have the same context, depending on where this code is run, and whether or not your code is running in strict mode.