iterama/web/zip-async.js

Composable functional (async) iterable helpers

import _defineProperty from "@babel/runtime/helpers/esm/defineProperty";
import _awaitAsyncGenerator from "@babel/runtime/helpers/esm/awaitAsyncGenerator";
import _wrapAsyncGenerator from "@babel/runtime/helpers/esm/wrapAsyncGenerator";
export function zipAsync() {
  for (var _len = arguments.length, iterables = new Array(_len), _key = 0; _key < _len; _key++) {
    iterables[_key] = arguments[_key];
  }

  return _defineProperty({}, Symbol.asyncIterator, function () {
    return _wrapAsyncGenerator(function* () {
      var iterators = iterables.map(function (i) {
        return i[Symbol.asyncIterator]();
      });

      try {
        while (true) {
          var values = yield _awaitAsyncGenerator(Promise.all(iterators.map(function (i) {
            return i.next();
          })));

          if (values.some(function (v) {
            return v.done;
          })) {
            break;
          }

          yield values.map(function (v) {
            return v.value;
          });
        }
      } finally {
        yield _awaitAsyncGenerator(Promise.all(iterators.map(function (i) {
          var _i$return;

          return (_i$return = i.return) === null || _i$return === void 0 ? void 0 : _i$return.call(i);
        })));
      }
    })();
  });
}
//# sourceMappingURL=zip-async.js.map