Explore topic-wise MCQs in Javascript.

This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Javascript knowledge and support exam preparation. Choose a topic below to get started.

1.

Consider the following code snippet.
function printArr(n) 
{
 var len = n.length, p = 2;
 if (len == 2)
 console.log("Nothing is in Array");
 else 
 {
 do 
 {
 console.log(n[p]);
 } while (++p < len);
 }
}

What does the above code result?

A. Prints the numbers in the array in the reverse order
B. Prints the numbers in the array in order
C. Prints Nothing is in Array
D. Prints 2 to the length of the array
E. None of these
Answer» C. Prints Nothing is in Array
Discussion
2.

What will the following code snippet work? If not, what will be the error?
function test(p) 
{ 
 for (; p.next; p = p.next) ;
 return p;
}
A. No, this will not iterate
B. No, this will result in a runtime error with the message Cannot use Linked List
C. No, this will throw an exception as only numerics can be used in a for loop
D. Yes, this will work
E. None of these
Answer» E. None of these
Discussion
3.

Consider the following code snippet
function fun(f) 
{
 if (f === undefined) debugger;
}

What could be the task of the statement debugger?

A. It is used to find error in the statement
B. It is used as a keyword that debugs the entire program at once
C. It debugs the error in that statement and restarts the statement s execution
D. It does nothing but a simple breakpoint
E. None of these
Answer» E. None of these
Discussion
4.

Consider the following code snippet.
while (n != 0)
{
 if (n == 1) 
 continue;
 else 
 n++;
}

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

A. The continue keyword breaks out of the loop
B. The continue keyword restarts the loop
C. The continue keyword skips the next iteration
D. The continue keyword skips the rest of the statements in that iteration
E. None of these
Answer» E. None of these
Discussion
5.

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

A. the iteration is finite when an interpreter is used
B. The body of the loop is executed only once
C. Before each iteration, the interpreter evaluates the variable expression and assigns the name of the property
D. The iterations can be infinite when an interpreter is used
E. None of these
Answer» D. The iterations can be infinite when an interpreter is used
Discussion
6.

What will the following code snippet work? If not, what will be the error?

A. No, this will not iterate
B. No, this will result in a runtime error with the message Cannot use Linked List
C. No, this will throw an exception as only numerics can be used in a for loop
D. Yes, this will work
E. None of these
Answer» E. None of these
Discussion
7.

Consider the following code snippet

A. It is used to find error in the statement
B. It is used as a keyword that debugs the entire program at once
C. It debugs the error in that statement and restarts the statement s execution
D. It does nothing but a simple breakpoint
E. None of these
Answer» E. None of these
Discussion