1.

Guess the output of the following code:

Answer»
var x = 23;

(function(){
var x = 43;
(function random(){
x++;
console.log(x);
var x = 21;
})();
})();  Answer:

Output is NaN.

random() function has functional scope since x is declared and hoisted in the functional scope.

Rewriting the random function will give a better idea about the output:

function random(){
var x; // x is hoisted
x++; // x is not a number since it is not initialized yet
console.log(x); // Outputs NaN
x = 21; // Initialization of x
}


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