rxjs/dist/esm5/internal/operators/scanInternals.js

Reactive Extensions for modern JavaScript

import { OperatorSubscriber } from './OperatorSubscriber';
export function scanInternals(accumulator, seed, hasSeed, emitOnNext, emitBeforeComplete) {
    return function (source, subscriber) {
        var hasState = hasSeed;
        var state = seed;
        var index = 0;
        source.subscribe(new OperatorSubscriber(subscriber, function (value) {
            var i = index++;
            state = hasState
                ?
                    accumulator(state, value, i)
                :
                    ((hasState = true), value);
            emitOnNext && subscriber.next(state);
        }, emitBeforeComplete &&
            (function () {
                hasState && subscriber.next(state);
                subscriber.complete();
            })));
    };
}
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