What will be the step of the interpreter in a jump statement when an exception i

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

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1) What are the three important manipulations done in a for loop on a loop variable?

2) 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);
      }
 }

3) What will happen if the body of a for/in loop deletes a property that has not yet been enumerated?

4) Consider the following code snippet

function tail(o)
{
      for (; o.next; o = o.next) ;
     return o;
 }

5) Consider the following code snippet

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