Having a Doubt in this question

#1

My answer is “1function” but u have given “1undefined”. I am not getting how this option is right? Just explain this question.

#3

Hi @mansisingh2803,
At first nearly everything in JavaScript is an object other than six things that are not objects which are — null , undefined , strings, numbers, boolean, and symbols. These are called primitive values or primitive types. the answer should be 1undefined because
Consider the part within the first pair of parentheses: (function(){})(); …it is a regular function expression. Then look at the last pair (function(){})(); , this is normally added to an expression to call a function; in this case, our prior expression.

This pattern is often used when trying to avoid polluting the global namespace, because all the variables used inside the IIFE (like in any other normal function) are not visible outside its scope.
This is why, maybe, you confused this construction with an event-handler for window.onload , because it’s often used as this:

(function(){
  // all your code here
  var foo = function() {};
  window.onload = foo;
  // ...
})();
// foo is unreachable here (it’s undefined)
#4

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#5

Thanku for the explaination

1 Like
#6

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