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node_modules/rxjs/_esm2015/operators/combineLatest.js

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+import { ArrayObservable } from '../observable/ArrayObservable';
+import { isArray } from '../util/isArray';
+import { OuterSubscriber } from '../OuterSubscriber';
+import { subscribeToResult } from '../util/subscribeToResult';
+const none = {};
+/* tslint:enable:max-line-length */
+/**
+ * Combines multiple Observables to create an Observable whose values are
+ * calculated from the latest values of each of its input Observables.
+ *
+ * <span class="informal">Whenever any input Observable emits a value, it
+ * computes a formula using the latest values from all the inputs, then emits
+ * the output of that formula.</span>
+ *
+ * <img src="./img/combineLatest.png" width="100%">
+ *
+ * `combineLatest` combines the values from this Observable with values from
+ * Observables passed as arguments. This is done by subscribing to each
+ * Observable, in order, and collecting an array of each of the most recent
+ * values any time any of the input Observables emits, then either taking that
+ * array and passing it as arguments to an optional `project` function and
+ * emitting the return value of that, or just emitting the array of recent
+ * values directly if there is no `project` function.
+ *
+ * @example <caption>Dynamically calculate the Body-Mass Index from an Observable of weight and one for height</caption>
+ * var weight = Rx.Observable.of(70, 72, 76, 79, 75);
+ * var height = Rx.Observable.of(1.76, 1.77, 1.78);
+ * var bmi = weight.combineLatest(height, (w, h) => w / (h * h));
+ * bmi.subscribe(x => console.log('BMI is ' + x));
+ *
+ * // With output to console:
+ * // BMI is 24.212293388429753
+ * // BMI is 23.93948099205209
+ * // BMI is 23.671253629592222
+ *
+ * @see {@link combineAll}
+ * @see {@link merge}
+ * @see {@link withLatestFrom}
+ *
+ * @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] An optional function to project the values from
+ * the combined latest values into a new value 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 combineLatest
+ * @owner Observable
+ */
+export function combineLatest(...observables) {
+    let project = null;
+    if (typeof observables[observables.length - 1] === 'function') {
+        project = observables.pop();
+    }
+    // if the first and only other argument besides the resultSelector is an array
+    // assume it's been called with `combineLatest([obs1, obs2, obs3], project)`
+    if (observables.length === 1 && isArray(observables[0])) {
+        observables = observables[0].slice();
+    }
+    return (source) => source.lift.call(new ArrayObservable([source, ...observables]), new CombineLatestOperator(project));
+}
+export class CombineLatestOperator {
+    constructor(project) {
+        this.project = project;
+    }
+    call(subscriber, source) {
+        return source.subscribe(new CombineLatestSubscriber(subscriber, this.project));
+    }
+}
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+export class CombineLatestSubscriber extends OuterSubscriber {
+    constructor(destination, project) {
+        super(destination);
+        this.project = project;
+        this.active = 0;
+        this.values = [];
+        this.observables = [];
+    }
+    _next(observable) {
+        this.values.push(none);
+        this.observables.push(observable);
+    }
+    _complete() {
+        const observables = this.observables;
+        const len = observables.length;
+        if (len === 0) {
+            this.destination.complete();
+        }
+        else {
+            this.active = len;
+            this.toRespond = len;
+            for (let i = 0; i < len; i++) {
+                const observable = observables[i];
+                this.add(subscribeToResult(this, observable, observable, i));
+            }
+        }
+    }
+    notifyComplete(unused) {
+        if ((this.active -= 1) === 0) {
+            this.destination.complete();
+        }
+    }
+    notifyNext(outerValue, innerValue, outerIndex, innerIndex, innerSub) {
+        const values = this.values;
+        const oldVal = values[outerIndex];
+        const toRespond = !this.toRespond
+            ? 0
+            : oldVal === none ? --this.toRespond : this.toRespond;
+        values[outerIndex] = innerValue;
+        if (toRespond === 0) {
+            if (this.project) {
+                this._tryProject(values);
+            }
+            else {
+                this.destination.next(values.slice());
+            }
+        }
+    }
+    _tryProject(values) {
+        let result;
+        try {
+            result = this.project.apply(this, values);
+        }
+        catch (err) {
+            this.destination.error(err);
+            return;
+        }
+        this.destination.next(result);
+    }
+}
+//# sourceMappingURL=combineLatest.js.map