Prevent recalc script from looping infinitely in a Scriptable Checkout script

To prevent client side (Scriptable Checkout) scripts deployed on 'recalc function' from looping infinitely, users must use a 'control' variable to control the execution of the script's function. Users would need to use a custom field as the 'control' variable. The following code demonstrates the use of a custom field as 'control' variable:

function customRecalc(){
     //condition to prevent script execution
     if(nlapiGetFieldValue('custbody_execute') != 'T'){
          //set field to prevent re-execution
          nlapiSetFieldValue('custbody_execute','T');
          try{
               //Do some processing
               int count = nlapiGetLineItemCount('item');
               for(var i=1; i<=count; i++){
                    nlapiSelectLineItem('item',i);
                    nlapiSetCurrentLineItemValue('item','price',i,'2');
                    nlapiCommitLineItem('item');
               }
          }
          finally{
               //reset field to allow future execution of recalc function
               nlapiSetFieldValue('custbody_execute','F');
          }
     }
}