1.
Consider the code snippet given below
var count = [1,,3];
What is the observation made?

2.
Consider the following code snippet
var a1 = [,,,]; 
var a2 = new Array(3); 
0 in a1 
0 in a2
The result would be

3.
The pop() method of the array does which of the following task ?

4.
Consider the following code snippet :
if (!a[i]) continue ;
What is the observation made ?

5.
What will happen if reverse() and join() methods are used simultaneously ?