Welcome to the Basics of JavaScript MCQs Page

Dive deep into the fascinating world of Basics of JavaScript with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Basics of JavaScript, a crucial aspect of JavaScript. In this section, you will encounter a diverse range of MCQs that cover various aspects of Basics of JavaScript, 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 Basics of JavaScript. 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 Basics of JavaScript. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Basics of JavaScript MCQs | Page 5 of 7

Explore more Topics under JavaScript

01

Arrays and Functions

02

Classes and Modules

03

Server Side and Client Side Scripting

04

Document Object Model and Event Handling

05

Graphics and Rendering

06

Performance Measures in JavaScript

07

Socket Programming with JavaScript

08

Parsing, Benchmarking and Logging

09

Invocation and Performance

10

Caching and Debugging

11

JavaScript Animation

Q41.

Consider the following code snippet
function tail(o)
{
for (; o.next; o = o.next) ;
return o;
}
Will the above code snippet work? If not, what will be the error?

No, this will throw an exception as only numerics can be used in a for loop

No, this will not iterate

Yes, this will work

No, this will result in a runtime error with the message "Cannot use Linked List"

Discuss

Answer: (c).Yes, this will work

Q42.

One of the special feature of an interpreter in reference with the for loop is that

Before each iteration, the interpreter evaluates the variable expression and assigns the name of the property

The iterations can be infinite when an interpreter is used

The body of the loop is executed only once

All of the mentioned

Discuss

Answer: (a).Before each iteration, the interpreter evaluates the variable expression and assigns the name of the property

Q43.

What will happen if the body of a for/in loop deletes a property that has not yet been enumerated?

The property will be stored in a cache

The loop will not run

That property will not be enumerated

All of the mentioned

Discuss

Answer: (c).That property will not be enumerated

Q44.

What will be the step of the interpreter in a jump statement when an exception is thrown?

The interpreter stops its work

The interpreter throws another exception

The interpreter jumps to the nearest enclosing exception handler

None of the mentioned

Discuss

Answer: (c).The interpreter jumps to the nearest enclosing exception handler

Q45.

Consider the following code snippet. What will be the role of the continue keyword in the above code snippet?

while (a != 0)
{
   if (spam>a == 1) 
       continue;
   else 
       a++;
}

The continue keyword restarts the loop

The continue keyword skips the next iteration

The continue keyword skips the rest of the statements in that iteration

None of the mentioned

Discuss

Answer: (c).The continue keyword skips the rest of the statements in that iteration

Q46.

Consider the following code snippet

function f(o)
{
if (o === undefined) debugger;
}

What could be the task of the statement debugger?

It does nothing but a simple breakpoint

It debugs the error in that statement and restarts the statement's execution

It is used as a keyword that debugs the entire program at once

All of the mentioned

Discuss

Answer: (a).It does nothing but a simple breakpoint

Q47.

Among the keywords below, which one is not a statement?

debugger

with

use strict

Discuss

Answer: (d).use strict

Q48.

The unordered collection of properties, each of which has a name and a value is called

String

Object

Serialized Object

All of the mentioned

Discuss

Answer: (b).Object

Q49.

The object has three object attributes namely

Class, parameters, object's extensible flag

Prototype, class, objects's parameters

Prototype, class, object's extensible flag

Native object, Classes and Interfacces and Object's extensible flag

Discuss

Answer: (c).Prototype, class, object's extensible flag

Q50.

Consider the following code snippet. In the snippet, firstname and surname are

var book = {
    "main title": "JavaScript", 
    'sub-title': "The Definitive Guide", 
    "for": "all audiences", 
    author: { 
      firstname: "David", 
      surname: "Flanagan" 
    }
  };

properties

property values

property names

objects

Discuss

Answer: (c).property names

Page 5 of 7

Welcome to the Basics of JavaScript MCQs Page

Basics of JavaScript MCQs | Page 5 of 7

Explore more Topics under JavaScript

Arrays and Functions

Classes and Modules

Server Side and Client Side Scripting

Document Object Model and Event Handling

Graphics and Rendering

Performance Measures in JavaScript

Socket Programming with JavaScript

Parsing, Benchmarking and Logging

Invocation and Performance

Caching and Debugging

JavaScript Animation

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