code: function addValueToList(list, value) {
      for (var i = list.length - 1; i >= 0; i--) {
          if (list[i] == value) {
              return false;
          }
      }
      list.push(value);
      return true;
  }
docs: Add in list the value if none equals value
  
  @param list Array of objects comparable to value
  @param value New value to add
  @return {boolean} True if added or false if already exists in list