22 lines
807 B
JavaScript
22 lines
807 B
JavaScript
|
import { operate } from '../util/lift';
|
||
|
|
import { createOperatorSubscriber } from './OperatorSubscriber';
|
||
|
|
export function find(predicate, thisArg) {
|
||
|
|
return operate(createFind(predicate, thisArg, 'value'));
|
||
|
|
}
|
||
|
|
export function createFind(predicate, thisArg, emit) {
|
||
|
|
const findIndex = emit === 'index';
|
||
|
|
return (source, subscriber) => {
|
||
|
|
let index = 0;
|
||
|
|
source.subscribe(createOperatorSubscriber(subscriber, (value) => {
|
||
|
|
const i = index++;
|
||
|
|
if (predicate.call(thisArg, value, i, source)) {
|
||
|
|
subscriber.next(findIndex ? i : value);
|
||
|
|
subscriber.complete();
|
||
|
|
}
|
||
|
|
}, () => {
|
||
|
|
subscriber.next(findIndex ? -1 : undefined);
|
||
|
|
subscriber.complete();
|
||
|
|
}));
|
||
|
|
};
|
||
|
|
}
|
||
|
|
//# sourceMappingURL=find.js.map
|