What design pattern is this code in Javascript? -

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what kind of design pattern , significance of using closure?

(function(){     // code here }).call(this);

then difference between above code , following this keyword still refer same object in both ways.

(function(){     // code here })();

thats invoked function expression.

the purpose run code while protecting scope (so variables declared within don't leak out global scope.

call sets value of this function being applied on. without it, value set window object, there set outer scope.

EXIT