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So after looking at this longer, it makes a lot more sense. Basically, things are evaluated left to right. The first (function(){}) evaluates the function(){} and returns the function. Then the function is called with the second (1), and passing that in as a param.

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That's it. This is often called the module pattern. It's often used to avoid polluting the global scope with variables, e.g.

(function() { var x = 1; console.log(x); })();

console.log(x);

Would output:

1

undefined

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