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Javascript Loops MCQ Questions and Answers

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Javascript Loops MCQ Questions and Answers : We provide quiz questions on Javascript Loops where you can learn lots of objective questions with answers and you can also download pdf of javascript.

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1) 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”

Answer : A Discuss

2) 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

Answer : B Discuss

3) 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 Discuss

4) 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

Answer : A Discuss

5) 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

Answer : C Discuss

6) 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

Answer : C Discuss

7) Consider the following code snippet

while (a != 0)
 {
    if (a == 1)
         continue;
    else
         a++;
 }

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

    The continue keyword restarts the loop
    The continue keyword skips the next iteration
    The continue keyword skips the rest of the statements in that iteration
    None of the mentioned

Answer : C Discuss

8) 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

Answer : A Discuss

9) Among the keywords below, which one is not a statement?

    debugger
    with
    if
    use strict

Answer : D Discuss

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