Question

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What does this JavaScript snippet mean?

i was wondering why is the double Bracket in the end of the function?

here is simple of the anonymous function :

(function(){ ... })();

(function(){ … })();

what those for?

Answer 1

This declares an anonymous function and invokes it immediately on the same line. Think of it as:

foo();

where foo represents an anonymous function which is declared inline and cannot be referenced by a name.