Learn JavaScript MCQ Questions with answers and solutions.

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Q. A linkage of series of prototype objects is called as :

(A) prototype stack
(B) prototype chain
(C) prototype class
(D) prototypes

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Q. 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

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Q. Consider the following code snippet
function f() {};
The above prototype represents a

(A) Function f
(B) A custom constructor
(C) Prototype of a function
(D) Not valid

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Q. Identify the process done in the below code snippet
o = {x:1, y:{z:[false,null,""]}};
s = JSON.stringify(o);
p = JSON.parse(s);

(A) Object Encapsulation
(B) Object Serialization
(C) Object Abstraction
(D) Object Encoding

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Q. Javascript is _________ language.

(A) Programming
(B) Application
(C) None of These
(D) Scripting

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Q. Consider the following code snippet
function printArray(a)
{
var len = a.length, i = 0;
if (len == 0)
console.log("Empty Array");
else
{
do
{
console.log(a[i]);
} while (++i < len);
}
}
What does the above 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”

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Q. What are the three important manipulations done in a for loop on a loop variable?

(A) Updation, Incrementation, Initialization
(B) Initialization,Testing, Updation
(C) Testing, Updation, Testing
(D) Initialization,Testing, Incrementation

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Q. 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?

(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”

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

(A) Before each iteration, the interpreter evaluates the variable expression and assigns the name of the property
(B) The iterations can be infinite when an interpreter is used
(C) The body of the loop is executed only once
(D) All of the mentioned

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

(A) The property will be stored in a cache
(B) The loop will not run
(C) That property will not be enumerated
(D) All of the mentioned

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JavaScript MCQs with answers Page - 69

Q. A linkage of series of prototype objects is called as :

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

Q. Consider the following code snippet
function f() {};
The above prototype represents a

Q. Identify the process done in the below code snippet
o = {x:1, y:{z:[false,null,""]}};
s = JSON.stringify(o);
p = JSON.parse(s);

Q. Javascript is _________ language.

Q. Consider the following code snippet
function printArray(a)
{
var len = a.length, i = 0;
if (len == 0)
console.log("Empty Array");
else
{
do
{
console.log(a[i]);
} while (++i < len);
}
}
What does the above code result?

Q. What are the three important manipulations done in a for loop on a loop variable?

Q. 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?

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

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

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JavaScript MCQs with answers Page - 69

Q. A linkage of series of prototype objects is called as :

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

Q. Consider the following code snippet function f() {}; The above prototype represents a

Q. Identify the process done in the below code snippet o = {x:1, y:{z:[false,null,""]}}; s = JSON.stringify(o); p = JSON.parse(s);

Q. Javascript is _________ language.

Q. Consider the following code snippet function printArray(a) { var len = a.length, i = 0; if (len == 0) console.log("Empty Array"); else { do { console.log(a[i]); } while (++i < len); } } What does the above code result?

Q. What are the three important manipulations done in a for loop on a loop variable?

Q. 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?

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

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

Add MCQ in this Category

Browse Categories

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

Q. Consider the following code snippet
function f() {};
The above prototype represents a

Q. Identify the process done in the below code snippet
o = {x:1, y:{z:[false,null,""]}};
s = JSON.stringify(o);
p = JSON.parse(s);

Q. Consider the following code snippet
function printArray(a)
{
var len = a.length, i = 0;
if (len == 0)
console.log("Empty Array");
else
{
do
{
console.log(a[i]);
} while (++i < len);
}
}
What does the above code result?

Q. 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?