Last change
on this file since 6a3a178 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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[6a3a178] | 1 | import { Subscriber } from '../Subscriber';
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| 2 | export function pairwise() {
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| 3 | return (source) => source.lift(new PairwiseOperator());
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| 4 | }
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| 5 | class PairwiseOperator {
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| 6 | call(subscriber, source) {
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| 7 | return source.subscribe(new PairwiseSubscriber(subscriber));
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| 8 | }
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| 9 | }
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| 10 | class PairwiseSubscriber extends Subscriber {
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| 11 | constructor(destination) {
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| 12 | super(destination);
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| 13 | this.hasPrev = false;
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| 14 | }
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| 15 | _next(value) {
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| 16 | let pair;
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| 17 | if (this.hasPrev) {
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| 18 | pair = [this.prev, value];
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| 19 | }
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| 20 | else {
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| 21 | this.hasPrev = true;
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| 22 | }
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| 23 | this.prev = value;
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| 24 | if (pair) {
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| 25 | this.destination.next(pair);
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| 26 | }
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| 27 | }
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| 28 | }
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| 29 | //# sourceMappingURL=pairwise.js.map |
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