es6/operator/find.js

import { Subscriber } from '../Subscriber';
/* tslint:disable:max-line-length */
export function find(predicate, thisArg) {
    if (typeof predicate !== 'function') {
        throw new TypeError('predicate is not a function');
    }
    return this.lift(new FindValueOperator(predicate, this, false, thisArg));
}
export var FindValueOperator = (function () {
    function FindValueOperator(predicate, source, yieldIndex, thisArg) {
        this.predicate = predicate;
        this.source = source;
        this.yieldIndex = yieldIndex;
        this.thisArg = thisArg;
    }
    FindValueOperator.prototype.call = function (observer, source) {
        return source._subscribe(new FindValueSubscriber(observer, this.predicate, this.source, this.yieldIndex, this.thisArg));
    };
    return FindValueOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
export var FindValueSubscriber = (function (_super) {
    __extends(FindValueSubscriber, _super);
    function FindValueSubscriber(destination, predicate, source, yieldIndex, thisArg) {
        _super.call(this, destination);
        this.predicate = predicate;
        this.source = source;
        this.yieldIndex = yieldIndex;
        this.thisArg = thisArg;
        this.index = 0;
    }
    FindValueSubscriber.prototype.notifyComplete = function (value) {
        var destination = this.destination;
        destination.next(value);
        destination.complete();
    };
    FindValueSubscriber.prototype._next = function (value) {
        var _a = this, predicate = _a.predicate, thisArg = _a.thisArg;
        var index = this.index++;
        try {
            var result = predicate.call(thisArg || this, value, index, this.source);
            if (result) {
                this.notifyComplete(this.yieldIndex ? index : value);
            }
        }
        catch (err) {
            this.destination.error(err);
        }
    };
    FindValueSubscriber.prototype._complete = function () {
        this.notifyComplete(this.yieldIndex ? -1 : undefined);
    };
    return FindValueSubscriber;
}(Subscriber));
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