Javascript MCQ - English

Consider the following code snippet
function tail(o)
{

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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”

Answer : C
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1) 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

View Answer

2) Consider the following code snippet

function f(o)
  {
      if (o === undefined)
 debugger;
 }

What could be the task of the statement debugger?

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
All of the mentioned

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3) 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

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4) 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

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5) 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?

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
Prints “Empty Array”

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