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Following are the code to the given question:

function organizeItems(items) //defining a method organizeItems that takes an items in parameter

{

   var result = {};//defining an array as a result

   for(item of items) //defining for loop to count items value

{

          if(!(item.category in result))// use if to check category exists in dictionary

{

           result[item.category] = []; //use result to assign value in blank list         }                  

var name = item.itemName;   //defining variable that holds itemName value

       if(item.onSale)//use if to check item value

{

           name += '($)';//use name to add string value

       }

       result[item.category].push(name);    //use result to hold value

   }  

   return result;//return result value

}

Code explanation:

Defining a function "organizeItems" that takes "items" variable in parameter.Inside the function, an array "result" is declared, and a for loop is defined that counts items values and use if block to check categories exist in the dictionary.In the next step, a variable "name" is declared that holds "itemName" value, and use if to check item "onSale" it adds string value and uses a result variable to hold value, and define return keyword to return a "result" value.

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