Consider the following code snippet :
  var a = [];
a.unshift(1);

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Consider the following code snippet :

  var a = [];
a.unshift(1);
a.unshift(22);
a.shift();
a.unshift(3,[4,5]);
a.shift();
a.shift();
a.shift();

The final output for the shift() is



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  var a1 = [,,,];
var a2 = new Array(3);
0 in a1
0 in a2
The result would be

4) Consider the code snippet given below

var count = [1,,3];

What is the observation made?

5) The primary purpose of the array map() function is that it

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