30 lines
914 B
JavaScript
30 lines
914 B
JavaScript
import { Subscriber } from '../Subscriber';
|
|
export function defaultIfEmpty(defaultValue = null) {
|
|
return (source) => source.lift(new DefaultIfEmptyOperator(defaultValue));
|
|
}
|
|
class DefaultIfEmptyOperator {
|
|
constructor(defaultValue) {
|
|
this.defaultValue = defaultValue;
|
|
}
|
|
call(subscriber, source) {
|
|
return source.subscribe(new DefaultIfEmptySubscriber(subscriber, this.defaultValue));
|
|
}
|
|
}
|
|
class DefaultIfEmptySubscriber extends Subscriber {
|
|
constructor(destination, defaultValue) {
|
|
super(destination);
|
|
this.defaultValue = defaultValue;
|
|
this.isEmpty = true;
|
|
}
|
|
_next(value) {
|
|
this.isEmpty = false;
|
|
this.destination.next(value);
|
|
}
|
|
_complete() {
|
|
if (this.isEmpty) {
|
|
this.destination.next(this.defaultValue);
|
|
}
|
|
this.destination.complete();
|
|
}
|
|
}
|
|
//# sourceMappingURL=defaultIfEmpty.js.map
|