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

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

Consider the following code snippetfunction f(o) { if (o === undefined) debugger;}What could be the task of the statement debugger?

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

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

Consider the following code snippet. What does the code result?

Prints the numbers in the array in the reverse order

Prints the numbers in the array in order

Prints the numbers in the array in the reverse order

Prints 0 to the length of the array

Consider the following statement:var count = 0;while (count < 10) { console.log(count); count++;}In the above code snippet, what happens?

The values of count is logged or stored in a particular location or storage

The value of count from 0 to 9 is displayed in the console

The escape sequence "f" stands for

Representation of functions that returns a value

Assume that we have to convert "false" that is a non-string to string. The command that we use is (without invoking the "new" operator)

Both false.toString() and String(false)

Consider the following code snippetfunction 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 result in a runtime error with the message "Cannot use Linked List"

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

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

The main purpose of a "Live Wire" in NetScape is to

Support only non relational database

Create linkage between client side and server side

Permit server side, JavaScript code, to connect to RDBMS

Support only non relational database

31 + Mcqs in Basics of JavaScript in Javascript Page 1 McqOptions

1.	Consider the following snippet code:var string1 = "123";var intvalue = 123;alert( string1 + intvalue );The result would be
A.	123246
B.	246
C.	123123
D.	Exception
Answer» D. Exception

Discussion

2.	Consider the following code snippet. What will be the role of the continue keyword in the above code snippet?
A.	The continue keyword restarts the loop
B.	The continue keyword skips the next iteration
C.	The continue keyword skips the rest of the statements in that iteration
D.	None of the mentioned
Answer» D. None of the mentioned

Discussion

3.	Consider the following code snippet. In the snippet, firstname and surname are
A.	properties
B.	property values
C.	property names
D.	objects
Answer» D. objects

Discussion

4.	Identify the process done in the below code snippet
A.	Object Encapsulation
B.	Object Serialization
C.	Object Abstraction
D.	Object Encoding
Answer» C. Object Abstraction

Discussion

5.	Variable declared inside JavaScript Function will be called as ____________.
A.	Local Variables
B.	Global Variables
C.	Both a and b
D.	None of the above
Answer» B. Global Variables

Discussion

6.	It is good to include JS code inside footer section in order to speed up the Page loading time of Webpage.
A.	True
B.	False
C.	Can't say
D.	None of the above
Answer» B. False

Discussion

7.	Consider the following code snippetfunction f(o) { if (o === undefined) debugger;}What could be the task of the statement debugger?
A.	It does nothing but a simple breakpoint
B.	It debugs the error in that statement and restarts the statement's execution
C.	It is used as a keyword that debugs the entire program at once
D.	All of the mentioned
Answer» B. It debugs the error in that statement and restarts the statement's execution

Discussion

8.	The output for the following code snippet would most appropriately be
A.	10
B.	Error
C.	1
D.	5
Answer» D. 5

Discussion

9.	Which attribute is used to specifies that the script is executed when the page has finished parsing (only for external scripts)
A.	parse
B.	async
C.	defer
D.	type
Answer» D. type

Discussion

10.	To determine whether one object is the prototype of (or is part of the prototype chain of) another object, one should use the
A.	isPrototypeOf() method
B.	equals() method
C.
Answer» B. equals() method

Discussion

11.	Consider the following statements:var text = "testing: 1, 2, 3"; // Sample textvar pattern = /d+/g // Matches all instances of one or more digitsIn order to check if the pattern matches with the string "text", the statement is
A.	text==pattern
B.	text.equals(pattern)
C.	text.test(pattern)
D.	pattern.test(text)
Answer» E.

Discussion

12.	JS code included inside head section is loaded before loading page.
A.	True
B.	False
C.	Can't say
D.	None of the above
Answer» B. False

Discussion

13.	The "var" and "function" are
A.	Keywords
B.	Declaration statements
C.	Datatypes
D.	Prototypes
Answer» C. Datatypes

Discussion

14.	Consider the following code snippet. What does the code result?
A.	Prints the numbers in the array in order
B.	Prints the numbers in the array in the reverse order
C.	Prints 0 to the length of the array
D.	Prints "Empty Array"
Answer» B. Prints the numbers in the array in the reverse order

Discussion

15.	Which is a more efficient code snippet ?
A.	Code 1
B.	Code 2
C.	Both Code 1 and Code 2
D.	Cannot Compare
Answer» B. Code 2

Discussion

16.	Consider the following statement:var count = 0;while (count < 10) { console.log(count); count++;}In the above code snippet, what happens?
A.	The values of count is logged or stored in a particular location or storage
B.	The value of count from 0 to 9 is displayed in the console
C.	An error is displayed
D.	An exception is thrown
Answer» C. An error is displayed

Discussion

17.	"An expression that can legally appear on the left side of an assignment expression." is a well known explanation for variables, properties of objects, and elements of arrays. They are called
A.	Properties
B.	Prototypes
C.	Lvalue
D.	Definition
Answer» D. Definition

Discussion

18.	The snippet that has to be used to check if "a" is not equal to "null" is
A.	if(a!=null)
B.	if (!a)
C.	if(a!null)
D.	if(a!==null)
Answer» E.

Discussion

19.	Underscore can be used as first letter while declaring variable in JavaScript.
A.	True
B.	False
C.	Depends on the browser
D.	None of the above
Answer» B. False

Discussion

20.	The JavaScript's syntax calling ( or executing ) a function or method is called
A.	Primary expression
B.	Functional expression
C.	Invocation expression
D.	Property Access Expression
Answer» D. Property Access Expression

Discussion

21.	We can embed JS code inside HTML directly ?
A.	True
B.	False
C.	Depends on the browser
D.	None of the above
Answer» B. False

Discussion

22.	The escape sequence "f" stands for
A.	Floating numbers
B.	Representation of functions that returns a value
C.	f is not present in JavaScript
D.	Form feed
Answer» E.

Discussion

23.	Local Variables are destroyed after execution of function.
A.	True
B.	False
C.	Can't say
D.	None of the above
Answer» B. False

Discussion

24.	A hexadecimal literal begins with
A.	00
B.	0x
C.	0X
D.	Both 0x and 0X
Answer» E.

Discussion

25.	When there is an indefinite or an infinity value during an arithmetic value computation, javascript
A.	Prints an exception error
B.	Prints an overflow error
C.	Displays "Infinity"
D.	Prints the value as such
Answer» D. Prints the value as such

Discussion

26.	What kind of an expression is "new Point(2,3)"?
A.	Primary Expression
B.	Object Creation Expression
C.	Invocation Expression
D.	Constructor Calling Expression
Answer» C. Invocation Expression

Discussion

27.	A linkage of series of prototype objects is called as :
A.	prototype stack
B.	prototype chain
C.	prototype class
D.	prototypes
Answer» C. prototype class

Discussion

28.	Assume that we have to convert "false" that is a non-string to string. The command that we use is (without invoking the "new" operator)
A.	false.toString()
B.	String(false)
C.	String newvariable="false"
D.	Both false.toString() and String(false)
Answer» E.

Discussion

29.	Consider the below given syntax:book[datatype]=assignment_value;In the above syntax, the datatype within the square brackets must be
A.	An integer
B.	A String
C.	An object
D.	None of the mentioned
Answer» C. An object

Discussion

30.	Consider the following code snippetfunction tail(o) { for (; o.next; o = o.next) ; return o;}Will the above code snippet work? If not, what will be the error?
A.	No, this will throw an exception as only numerics can be used in a for loop
B.	No, this will not iterate
C.	Yes, this will work
D.	No, this will result in a runtime error with the message "Cannot use Linked List"
Answer» D. No, this will result in a runtime error with the message "Cannot use Linked List"

Discussion

31.	The main purpose of a "Live Wire" in NetScape is to
A.	Create linkage between client side and server side
B.	Permit server side, JavaScript code, to connect to RDBMS
C.	Support only non relational database
D.	To interpret JavaScript code
Answer» C. Support only non relational database

Discussion

Explore topic-wise MCQs in Javascript.

Consider the following snippet code:var string1 = "123";var intvalue = 123;alert( string1 + intvalue );The result would be

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

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

Identify the process done in the below code snippet

Variable declared inside JavaScript Function will be called as ____________.

It is good to include JS code inside footer section in order to speed up the Page loading time of Webpage.

Consider the following code snippetfunction f(o) { if (o === undefined) debugger;}What could be the task of the statement debugger?

The output for the following code snippet would most appropriately be

Which attribute is used to specifies that the script is executed when the page has finished parsing (only for external scripts)

To determine whether one object is the prototype of (or is part of the prototype chain of) another object, one should use the

Consider the following statements:var text = "testing: 1, 2, 3"; // Sample textvar pattern = /d+/g // Matches all instances of one or more digitsIn order to check if the pattern matches with the string "text", the statement is

JS code included inside head section is loaded before loading page.

The "var" and "function" are

Consider the following code snippet. What does the code result?

Which is a more efficient code snippet ?

Consider the following statement:var count = 0;while (count < 10) { console.log(count); count++;}In the above code snippet, what happens?

"An expression that can legally appear on the left side of an assignment expression." is a well known explanation for variables, properties of objects, and elements of arrays. They are called

The snippet that has to be used to check if "a" is not equal to "null" is

Underscore can be used as first letter while declaring variable in JavaScript.

The JavaScript's syntax calling ( or executing ) a function or method is called

We can embed JS code inside HTML directly ?

The escape sequence "f" stands for

Local Variables are destroyed after execution of function.

A hexadecimal literal begins with

When there is an indefinite or an infinity value during an arithmetic value computation, javascript

What kind of an expression is "new Point(2,3)"?

A linkage of series of prototype objects is called as :

Assume that we have to convert "false" that is a non-string to string. The command that we use is (without invoking the "new" operator)

Consider the below given syntax:book[datatype]=assignment_value;In the above syntax, the datatype within the square brackets must be

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

The main purpose of a "Live Wire" in NetScape is to