Welcome to the Arrays and Functions MCQs Page

Dive deep into the fascinating world of Arrays and Functions with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Arrays and Functions, a crucial aspect of JavaScript. In this section, you will encounter a diverse range of MCQs that cover various aspects of Arrays and Functions, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within JavaScript.

Check out the MCQs below to embark on an enriching journey through Arrays and Functions. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of JavaScript.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Arrays and Functions. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Arrays and Functions MCQs | Page 1 of 4

Q1.
Consider the code snippet given below:

var count = [1,,3];

Answer: (a).The omitted value takes "undefined"
Q2.
Consider the following code snippet. The result would be
var a1 = [,,,];
var a2 = new Array(3);
0 in a1
0 in a2
Q3.
The pop() method of the array does which of the following task ?
Answer: (a).decrements the total length by 1
Q4.
Consider the following code snippet :

if (!a[i]) continue ;

What is the observation made ?
Q5.
What will happen if reverse() and join() methods are used simultaneously ?
Answer: (a).Reverses and stores in the same array
Q6.
Consider the following code snippet :

var a = [1,2,3,4,5];
a.slice(0,3);

What is the possible output for the above code snippet ?
Q7.
Consider the following code snippet. The final output for the shift() is
var a = [];
a.unshift(1);
a.unshift(22);
a.shift();
a.unshift(3,[4,5]);
a.shift();
a.shift();
a.shift();
Q8.
The primary purpose of the array map() function is that it
Answer: (c).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
Q9.
The reduce and reduceRight methods follow a common operation called