Questions and answers for exam Preparation

MCQs

Total Questions : 82 | Page 5 of 9 pages

Question 41. What are the three important manipulations done in a for loop on a loop variable?

Updation, Incrementation, Initialization
Initialization,Testing, Updation
Testing, Updation, Testing
Initialization,Testing, Incrementation

Discuss Question

Answer: Option B. -> Initialization,Testing, Updation

Question 42. 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 Question

Answer: Option C. -> Yes, this will work

Question 43. 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 Question

Answer: Option A. -> Before each iteration, the interpreter evaluates the variable expression and assigns the name of the property

Question 44. 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 Question

Answer: Option C. -> That property will not be enumerated

Question 45. 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 Question

Answer: Option C. -> The interpreter jumps to the nearest enclosing exception handler

Question 46. Consider the following code snippet
function f(o)
{
if (o === undefined) debugger;
}
What could be the task of the statement debugger?