Last change
on this file since 6a3a178 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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File size:
914 bytes
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[6a3a178] | 1 | import { Subscriber } from '../Subscriber';
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| 2 | export function defaultIfEmpty(defaultValue = null) {
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| 3 | return (source) => source.lift(new DefaultIfEmptyOperator(defaultValue));
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| 4 | }
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| 5 | class DefaultIfEmptyOperator {
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| 6 | constructor(defaultValue) {
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| 7 | this.defaultValue = defaultValue;
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| 8 | }
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| 9 | call(subscriber, source) {
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| 10 | return source.subscribe(new DefaultIfEmptySubscriber(subscriber, this.defaultValue));
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| 11 | }
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| 12 | }
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| 13 | class DefaultIfEmptySubscriber extends Subscriber {
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| 14 | constructor(destination, defaultValue) {
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| 15 | super(destination);
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| 16 | this.defaultValue = defaultValue;
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| 17 | this.isEmpty = true;
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| 18 | }
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| 19 | _next(value) {
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| 20 | this.isEmpty = false;
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| 21 | this.destination.next(value);
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| 22 | }
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| 23 | _complete() {
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| 24 | if (this.isEmpty) {
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| 25 | this.destination.next(this.defaultValue);
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| 26 | }
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| 27 | this.destination.complete();
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| 28 | }
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| 29 | }
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| 30 | //# sourceMappingURL=defaultIfEmpty.js.map |
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