find.js
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import { Subscriber } from '../Subscriber';
export function find(predicate, thisArg) {
if (typeof predicate !== 'function') {
throw new TypeError('predicate is not a function');
}
return (source) => source.lift(new FindValueOperator(predicate, source, false, thisArg));
}
export class FindValueOperator {
constructor(predicate, source, yieldIndex, thisArg) {
this.predicate = predicate;
this.source = source;
this.yieldIndex = yieldIndex;
this.thisArg = thisArg;
}
call(observer, source) {
return source.subscribe(new FindValueSubscriber(observer, this.predicate, this.source, this.yieldIndex, this.thisArg));
}
}
export class FindValueSubscriber extends Subscriber {
constructor(destination, predicate, source, yieldIndex, thisArg) {
super(destination);
this.predicate = predicate;
this.source = source;
this.yieldIndex = yieldIndex;
this.thisArg = thisArg;
this.index = 0;
}
notifyComplete(value) {
const destination = this.destination;
destination.next(value);
destination.complete();
this.unsubscribe();
}
_next(value) {
const { predicate, thisArg } = this;
const index = this.index++;
try {
const result = predicate.call(thisArg || this, value, index, this.source);
if (result) {
this.notifyComplete(this.yieldIndex ? index : value);
}
}
catch (err) {
this.destination.error(err);
}
}
_complete() {
this.notifyComplete(this.yieldIndex ? -1 : undefined);
}
}
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