How to customize sendKeys(protractor.Key.)

I tried to add the following function as a helper at the beginning

exports.EditTime = function (number) {
element(by.className('numberFormat p-inputtext p-component')).sendKeys(protractor.Key.number);
  element(by.className('numberFormat p-inputtext p-component')).sendKeys(protractor.Key.ENTER);
}

But it seems doesn't work if I assigned number as NUMPAD1, NUMPAD2 ..... Therefore, I changed the function into a switch case function which looks stupid...

exports.EditTime = function (number) {
  switch (number) {
    case 1:
      element(by.className('numberFormat p-inputtext p-component')).sendKeys(protractor.Key.NUMPAD1);
    case 2:
      element(by.className('numberFormat p-inputtext p-component')).sendKeys(protractor.Key.NUMPAD2);
    case 3:
      element(by.className('numberFormat p-inputtext p-component')).sendKeys(protractor.Key.NUMPAD3);
    case 4:
      element(by.className('numberFormat p-inputtext p-component')).sendKeys(protractor.Key.NUMPAD4);
    case 5:
      element(by.className('numberFormat p-inputtext p-component')).sendKeys(protractor.Key.NUMPAD5);
    case 6:
      element(by.className('numberFormat p-inputtext p-component')).sendKeys(protractor.Key.NUMPAD6);
    case 7:
      element(by.className('numberFormat p-inputtext p-component')).sendKeys(protractor.Key.NUMPAD7);
    case 8:
      element(by.className('numberFormat p-inputtext p-component')).sendKeys(protractor.Key.NUMPAD8);
    case 9:
      element(by.className('numberFormat p-inputtext p-component')).sendKeys(protractor.Key.NUMPAD9);
  }
  element(by.className('numberFormat p-inputtext p-component')).sendKeys(protractor.Key.ENTER);
  sleep(1000);
}

I am wondering if anyone has a better approach to implement such a function?