someMethod.js

function someMethod(setting, items, response) {
  var emptyMessage = {
    message: "You have not selected anything"
  };
  if (
    aService.isThisFooSetting(setting.type) &&
    !aService.isEditModeClear(setting.editMode) &&
    items.length === 0
  ) {
    response.errors.push(emptyMessage);
  }

  if (
    aService.isThisBarSetting(setting.type) &&
    !aService.isEditModeClear(setting.editMode) &&
    items.length === 0
  ) {
    response.errors.push(emptyMessage);
  }

  for (var j = 0; j < items.length; j++) {
    if (aService.isBlahSetting(setting.type)) {
      if (areItemsEmpty(items[j], setting.sections[j])) {
        response.errors.push(emptyMessage);
        break;
      }
    } else {
      var isEmpty;

      if (typeof items[j] === "undefined") {
        isEmpty = true;
      } else {
        switch (true) {
          case aService.isBSetting(setting.type):
            isEmpty =
              !aService.isOverwrite(setting.editMode) &&
              isEmptyInventory(items[j]);
            break;
          case aService.isCSetting(setting.type):
            isEmpty = items[j].devices === null;
            break;
          case aService.isDSetting(setting.type):
            isEmpty = items[j].package_id === null;
            break;
          case aService.isESetting(setting.type):
            if (!items[j].hasOwnProperty("partitions")) {
              isEmpty = true;
            } else {
              isEmpty = Object.keys(items[j].partitions).every(function(key) {
                return items[j].partitions[key].length === 0;
              });
            }
            break;
          case aService.isFSetting(setting.type):
            isEmpty =
              items[j].cap === null ||
              (items[j].cap !== 0 && !items[j].cap_interval);
            break;
          case aService.isGSetting(setting.type):
            isEmpty = items[j].status === "";
            break;
          case aService.isHSetting(setting.type):
            isEmpty =
              typeof items[j] !== "object" ||
              !(setting.type in items[j]) ||
              (items[j][setting.type] === null || items[j][setting.type] <= 0);
            break;
          case aService.isYSetting(setting.type):
            isEmpty = !("include" in items[j]) && !("exclude" in items[j]);
            break;
          case aService.isZSetting(setting.type):
            isEmpty = items[j].pacing_strategy === "";
            break;
          case aService.iXYSetting(setting.type):
            isEmpty =
              !items[j].amount ||
              parseFloat(items[j].amount) < 0 ||
              !items[j].interval;
            break;
          default:
            isEmpty =
              items[j].includedTotal === 0 && items[j].excludedTotal === 0;
            break;
        }
      }

      if (
        (aService.isOverwrite(setting.mode) ||
          aService.isPause(setting.mode)) &&
        isEmpty
      ) {
        response.errors.push(emptyMessage);
        break;
      }
    }
  }
  return response;
}