update

node_modules/rxjs/_esm2015/operators/last.js

@@ -0,0 +1,109 @@
+import { Subscriber } from '../Subscriber';
+import { EmptyError } from '../util/EmptyError';
+/* tslint:enable:max-line-length */
+/**
+ * Returns an Observable that emits only the last item emitted by the source Observable.
+ * It optionally takes a predicate function as a parameter, in which case, rather than emitting
+ * the last item from the source Observable, the resulting Observable will emit the last item
+ * from the source Observable that satisfies the predicate.
+ *
+ * <img src="./img/last.png" width="100%">
+ *
+ * @throws {EmptyError} Delivers an EmptyError to the Observer's `error`
+ * callback if the Observable completes before any `next` notification was sent.
+ * @param {function} predicate - The condition any source emitted item has to satisfy.
+ * @return {Observable} An Observable that emits only the last item satisfying the given condition
+ * from the source, or an NoSuchElementException if no such items are emitted.
+ * @throws - Throws if no items that match the predicate are emitted by the source Observable.
+ * @method last
+ * @owner Observable
+ */
+export function last(predicate, resultSelector, defaultValue) {
+    return (source) => source.lift(new LastOperator(predicate, resultSelector, defaultValue, source));
+}
+class LastOperator {
+    constructor(predicate, resultSelector, defaultValue, source) {
+        this.predicate = predicate;
+        this.resultSelector = resultSelector;
+        this.defaultValue = defaultValue;
+        this.source = source;
+    }
+    call(observer, source) {
+        return source.subscribe(new LastSubscriber(observer, this.predicate, this.resultSelector, this.defaultValue, this.source));
+    }
+}
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+class LastSubscriber extends Subscriber {
+    constructor(destination, predicate, resultSelector, defaultValue, source) {
+        super(destination);
+        this.predicate = predicate;
+        this.resultSelector = resultSelector;
+        this.defaultValue = defaultValue;
+        this.source = source;
+        this.hasValue = false;
+        this.index = 0;
+        if (typeof defaultValue !== 'undefined') {
+            this.lastValue = defaultValue;
+            this.hasValue = true;
+        }
+    }
+    _next(value) {
+        const index = this.index++;
+        if (this.predicate) {
+            this._tryPredicate(value, index);
+        }
+        else {
+            if (this.resultSelector) {
+                this._tryResultSelector(value, index);
+                return;
+            }
+            this.lastValue = value;
+            this.hasValue = true;
+        }
+    }
+    _tryPredicate(value, index) {
+        let result;
+        try {
+            result = this.predicate(value, index, this.source);
+        }
+        catch (err) {
+            this.destination.error(err);
+            return;
+        }
+        if (result) {
+            if (this.resultSelector) {
+                this._tryResultSelector(value, index);
+                return;
+            }
+            this.lastValue = value;
+            this.hasValue = true;
+        }
+    }
+    _tryResultSelector(value, index) {
+        let result;
+        try {
+            result = this.resultSelector(value, index);
+        }
+        catch (err) {
+            this.destination.error(err);
+            return;
+        }
+        this.lastValue = result;
+        this.hasValue = true;
+    }
+    _complete() {
+        const destination = this.destination;
+        if (this.hasValue) {
+            destination.next(this.lastValue);
+            destination.complete();
+        }
+        else {
+            destination.error(new EmptyError);
+        }
+    }
+}
+//# sourceMappingURL=last.js.map