Javascript loops MCQ - Quiz

What are the three most important manipulations performed on a loop variable in a for loop?

  • AUpdation, Incrementation, Initialization
  • BInitialization,Testing, Updation
  • CTesting, Updation, Testing
  • DInitialization,Testing, Incrementation

One of the unique characteristics of an interpreter in relation to the for loop is that

  • ABefore each iteration, the interpreter evaluates the variable expression and assigns the name of the property
  • BThe iterations can be infinite when an interpreter is used
  • CThe body of the loop is executed only once
  • DThe iteration is finite when an interpreter is used

What happens if the for/in loop body deletes a property that has not yet been enumerated?

  • AThe property will be stored in a cache
  • BThe loop will not run
  • CThat property will not be enumerated
  • DThe property will be enumerated

What is the purpose of the continue keyword in the following JavaScript code snippet? 
while (a != 0)
{
   if (a == 1) 
       continue;
   else 
       a++;
}

  • AThe continue keyword restarts the loop
  • BThe continue keyword skips the next iteration
  • CThe continue keyword skips the rest of the statements in that iteration
  • DThe continue keyword breaks out of the loop

What could the statement debugger in the following JavaScript code be doing? 
function f(o) 
{
     if (o === undefined) debugger;
}

  • AIt does nothing but a simple breakpoint
  • BIt debugs the error in that statement and restarts the statement's execution
  • CIt is used as a keyword that debugs the entire program at once
  • DIt is used to find error in the statement

What happens if the body of a for/in loop deletes an unenumerated property?

  • AThe property will be stored in a cache
  • BThe loop will not run
  • CThat property will not be enumerated
  • DThe property will be enumerated

When an exception is thrown, what step will the interpreter take?

  • AThe interpreter stops its work
  • BThe interpreter throws another exception
  • CThe interpreter jumps to the nearest enclosing exception handler
  • DThe interpreter throws an error

What could the statement debugger in the following JavaScript code be doing? 
function f(o) 
{
     if (o === undefined) debugger;
}

  • AIt does nothing but a simple breakpoint
  • BIt debugs the error in that statement and restarts the statement's execution
  • CIt is used as a keyword that debugs the entire program at once
  • DIt is used to find error in the statement

Which of the following keywords is not a statement?

  • ADebugger
  • BWith
  • Cif
  • Duse strict

When one loop is used within another loop, it is said to be a _______________.

  • Aouter loop
  • Binner loop
  • Cnested loop
  • Dnone of these

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