Consider the code snippet given below
var count = [1,,3];
What is the observation made?
The omitted value takes “undefined”
This results in an error
This results in an exception
None of the mentioned
Answer : A
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1) What will happen if reverse() and join() methods are used simultaneously ?
Reverses and stores in the same array
Reverses and concatenates the elements of the array
Reverses
All of the mentioned
View Answer
2) The primary purpose of the array map() function is that it
maps the elements of another array into itself
passes each element of the array and returns the necessary mapped elements
passes each element of the array on which it is invoked to the function you specify, and returns an array containing the values returned by that function
None of the mentioned
View Answer
3) Consider the following code snippet :
if (!a[i]) continue;
What is the observation made ?
Skips the undefined elements
Skips the non existent elements
Skips the null elements
All of the mentioned
View Answer
4) The method or operator used to identify the array is
5) Consider the following code snippet
var a1 = [,,,];
The result would be
var a2 = new Array(3);
0 in a1
0 in a2
