iterama/web/scan-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";
import _asyncIterator from "@babel/runtime/helpers/esm/asyncIterator";
export var scanAsync = function scanAsync(scanFn, initial) {
  return function (iterable) {
    return _defineProperty({}, Symbol.asyncIterator, function () {
      return _wrapAsyncGenerator(function* () {
        var state = yield _awaitAsyncGenerator(initial);
        var i = 0;
        var _iteratorNormalCompletion = true;
        var _didIteratorError = false;

        var _iteratorError;

        try {
          for (var _iterator = _asyncIterator(iterable), _step, _value; _step = yield _awaitAsyncGenerator(_iterator.next()), _iteratorNormalCompletion = _step.done, _value = yield _awaitAsyncGenerator(_step.value), !_iteratorNormalCompletion; _iteratorNormalCompletion = true) {
            var _value2 = _value;
            state = yield _awaitAsyncGenerator(scanFn(state, _value2, i++));
            yield state;
          }
        } catch (err) {
          _didIteratorError = true;
          _iteratorError = err;
        } finally {
          try {
            if (!_iteratorNormalCompletion && _iterator.return != null) {
              yield _awaitAsyncGenerator(_iterator.return());
            }
          } finally {
            if (_didIteratorError) {
              throw _iteratorError;
            }
          }
        }
      })();
    });
  };
};
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