iterama/native/zip-async.js

Composable functional (async) iterable helpers

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.zipAsync = zipAsync;

var _defineProperty2 = _interopRequireDefault(require("@babel/runtime/helpers/defineProperty"));

var _regenerator = _interopRequireDefault(require("@babel/runtime/regenerator"));

function zipAsync() {
  for (var _len = arguments.length, iterables = new Array(_len), _key = 0; _key < _len; _key++) {
    iterables[_key] = arguments[_key];
  }

  return (0, _defineProperty2.default)({}, Symbol.asyncIterator, _regenerator.default.mark(function _callee() {
    var iterators, values;
    return _regenerator.default.async(function _callee$(_context) {
      while (1) {
        switch (_context.prev = _context.next) {
          case 0:
            iterators = iterables.map(function (i) {
              return i[Symbol.asyncIterator]();
            });
            _context.prev = 1;

          case 2:
            if (!true) {
              _context.next = 12;
              break;
            }

            _context.next = 5;
            return _regenerator.default.awrap(Promise.all(iterators.map(function (i) {
              return i.next();
            })));

          case 5:
            values = _context.sent;

            if (!values.some(function (v) {
              return v.done;
            })) {
              _context.next = 8;
              break;
            }

            return _context.abrupt("break", 12);

          case 8:
            _context.next = 10;
            return values.map(function (v) {
              return v.value;
            });

          case 10:
            _context.next = 2;
            break;

          case 12:
            _context.prev = 12;
            _context.next = 15;
            return _regenerator.default.awrap(Promise.all(iterators.map(function (i) {
              return i.return == null ? void 0 : i.return();
            })));

          case 15:
            return _context.finish(12);

          case 16:
          case "end":
            return _context.stop();
        }
      }
    }, _callee, null, [[1,, 12, 16]], Promise);
  }));
}
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