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import { scan } from './scan';
import { takeLast } from './takeLast';
import { defaultIfEmpty } from './defaultIfEmpty';
import { pipe } from '../util/pipe';
export function reduce(accumulator, seed) {
if (arguments.length >= 2) {
return function reduceOperatorFunctionWithSeed(source) {
return pipe(scan(accumulator, seed), takeLast(1), defaultIfEmpty(seed))(source);
};
}
return function reduceOperatorFunction(source) {
return pipe(scan((acc, value, index) => accumulator(acc, value, index + 1)), takeLast(1))(source);
};
}
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