JavaScript MCQs with answers Page - 6

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Q. Consider the following code snippet.
What could be the task of the statement debugger?

Code:
function fun(f) 
{
     if (f === undefined) 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

A

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

Code:
while (n != 0)
{
   if (n == 1) 
       continue;
   else 
       n++;
}
  • (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

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

  • (A) The interpreter throws an error
  • (B) The interpreter jumps to the nearest enclosing exception handler
  • (C) The interpreter stops its work
  • (D) The interpreter throws another exception

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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 enumerated
  • (B) The loop will not run
  • (C) The property will be stored in a cache
  • (D) That property will not be enumerated

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Q. 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

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

Code:
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

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

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

A

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

Code:
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);
     }
}
  • (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

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Q. Javascript is an _______ language?

  • (A) Object-Oriented
  • (B) Object-Based
  • (C) Assembly-language
  • (D) High-level

A

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Q. Which of the following is the correct output for the following JavaScript code:

Code:
varx=5,y=1  
var obj ={ x:10}  
with(obj)  
{  
      alert(y)  
}  
  • (A) 1
  • (B) Error
  • (C) 10
  • (D) 5

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