code: function elementAtOrDefault(index, or) {
      return async function (it) {
          var e_19, _a;
          let i = 0;
          try {
              for (var it_2 = __asyncValues(it), it_2_1; it_2_1 = await it_2.next(), !it_2_1.done;) {
                  const item = it_2_1.value;
                  if (i === index) {
                      return item;
                  }
                  i = i + 1;
              }
          }
          catch (e_19_1) { e_19 = { error: e_19_1 }; }
          finally {
              try {
                  if (it_2_1 && !it_2_1.done && (_a = it_2.return)) await _a.call(it_2);
              }
              finally { if (e_19) throw e_19.error; }
          }
          return or;
      };
  }
docs: Enumerate until index and return the element at index, or consumes and return undefined