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node_modules/rxjs/_esm2015/operators/withLatestFrom.js

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+import { OuterSubscriber } from '../OuterSubscriber';
+import { subscribeToResult } from '../util/subscribeToResult';
+/* tslint:enable:max-line-length */
+/**
+ * Combines the source Observable with other Observables to create an Observable
+ * whose values are calculated from the latest values of each, only when the
+ * source emits.
+ *
+ * <span class="informal">Whenever the source Observable emits a value, it
+ * computes a formula using that value plus the latest values from other input
+ * Observables, then emits the output of that formula.</span>
+ *
+ * <img src="./img/withLatestFrom.png" width="100%">
+ *
+ * `withLatestFrom` combines each value from the source Observable (the
+ * instance) with the latest values from the other input Observables only when
+ * the source emits a value, optionally using a `project` function to determine
+ * the value to be emitted on the output Observable. All input Observables must
+ * emit at least one value before the output Observable will emit a value.
+ *
+ * @example <caption>On every click event, emit an array with the latest timer event plus the click event</caption>
+ * var clicks = Rx.Observable.fromEvent(document, 'click');
+ * var timer = Rx.Observable.interval(1000);
+ * var result = clicks.withLatestFrom(timer);
+ * result.subscribe(x => console.log(x));
+ *
+ * @see {@link combineLatest}
+ *
+ * @param {ObservableInput} other An input Observable to combine with the source
+ * Observable. More than one input Observables may be given as argument.
+ * @param {Function} [project] Projection function for combining values
+ * together. Receives all values in order of the Observables passed, where the
+ * first parameter is a value from the source Observable. (e.g.
+ * `a.withLatestFrom(b, c, (a1, b1, c1) => a1 + b1 + c1)`). If this is not
+ * passed, arrays will be emitted on the output Observable.
+ * @return {Observable} An Observable of projected values from the most recent
+ * values from each input Observable, or an array of the most recent values from
+ * each input Observable.
+ * @method withLatestFrom
+ * @owner Observable
+ */
+export function withLatestFrom(...args) {
+    return (source) => {
+        let project;
+        if (typeof args[args.length - 1] === 'function') {
+            project = args.pop();
+        }
+        const observables = args;
+        return source.lift(new WithLatestFromOperator(observables, project));
+    };
+}
+class WithLatestFromOperator {
+    constructor(observables, project) {
+        this.observables = observables;
+        this.project = project;
+    }
+    call(subscriber, source) {
+        return source.subscribe(new WithLatestFromSubscriber(subscriber, this.observables, this.project));
+    }
+}
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+class WithLatestFromSubscriber extends OuterSubscriber {
+    constructor(destination, observables, project) {
+        super(destination);
+        this.observables = observables;
+        this.project = project;
+        this.toRespond = [];
+        const len = observables.length;
+        this.values = new Array(len);
+        for (let i = 0; i < len; i++) {
+            this.toRespond.push(i);
+        }
+        for (let i = 0; i < len; i++) {
+            let observable = observables[i];
+            this.add(subscribeToResult(this, observable, observable, i));
+        }
+    }
+    notifyNext(outerValue, innerValue, outerIndex, innerIndex, innerSub) {
+        this.values[outerIndex] = innerValue;
+        const toRespond = this.toRespond;
+        if (toRespond.length > 0) {
+            const found = toRespond.indexOf(outerIndex);
+            if (found !== -1) {
+                toRespond.splice(found, 1);
+            }
+        }
+    }
+    notifyComplete() {
+        // noop
+    }
+    _next(value) {
+        if (this.toRespond.length === 0) {
+            const args = [value, ...this.values];
+            if (this.project) {
+                this._tryProject(args);
+            }
+            else {
+                this.destination.next(args);
+            }
+        }
+    }
+    _tryProject(args) {
+        let result;
+        try {
+            result = this.project.apply(this, args);
+        }
+        catch (err) {
+            this.destination.error(err);
+            return;
+        }
+        this.destination.next(result);
+    }
+}
+//# sourceMappingURL=withLatestFrom.js.map