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node_modules/rxjs/operators/find.js

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+"use strict";
+var __extends = (this && this.__extends) || function (d, b) {
+    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    function __() { this.constructor = d; }
+    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+};
+var Subscriber_1 = require('../Subscriber');
+/**
+ * Emits only the first value emitted by the source Observable that meets some
+ * condition.
+ *
+ * <span class="informal">Finds the first value that passes some test and emits
+ * that.</span>
+ *
+ * <img src="./img/find.png" width="100%">
+ *
+ * `find` searches for the first item in the source Observable that matches the
+ * specified condition embodied by the `predicate`, and returns the first
+ * occurrence in the source. Unlike {@link first}, the `predicate` is required
+ * in `find`, and does not emit an error if a valid value is not found.
+ *
+ * @example <caption>Find and emit the first click that happens on a DIV element</caption>
+ * var clicks = Rx.Observable.fromEvent(document, 'click');
+ * var result = clicks.find(ev => ev.target.tagName === 'DIV');
+ * result.subscribe(x => console.log(x));
+ *
+ * @see {@link filter}
+ * @see {@link first}
+ * @see {@link findIndex}
+ * @see {@link take}
+ *
+ * @param {function(value: T, index: number, source: Observable<T>): boolean} predicate
+ * A function called with each item to test for condition matching.
+ * @param {any} [thisArg] An optional argument to determine the value of `this`
+ * in the `predicate` function.
+ * @return {Observable<T>} An Observable of the first item that matches the
+ * condition.
+ * @method find
+ * @owner Observable
+ */
+function find(predicate, thisArg) {
+    if (typeof predicate !== 'function') {
+        throw new TypeError('predicate is not a function');
+    }
+    return function (source) { return source.lift(new FindValueOperator(predicate, source, false, thisArg)); };
+}
+exports.find = find;
+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;
+}());
+exports.FindValueOperator = FindValueOperator;
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+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_1.Subscriber));
+exports.FindValueSubscriber = FindValueSubscriber;
+//# sourceMappingURL=find.js.map