--- /dev/null
+import { Operator } from '../Operator';
+import { Subscriber } from '../Subscriber';
+import { Observable } from '../Observable';
+import { OuterSubscriber } from '../OuterSubscriber';
+import { InnerSubscriber } from '../InnerSubscriber';
+import { subscribeToResult } from '../util/subscribeToResult';
+import { ObservableInput, OperatorFunction, ObservedValueOf } from '../types';
+
+/* tslint:disable:max-line-length */
+export function withLatestFrom<T, R>(project: (v1: T) => R): OperatorFunction<T, R>;
+export function withLatestFrom<T, O2 extends ObservableInput<any>, R>(source2: O2, project: (v1: T, v2: ObservedValueOf<O2>) => R): OperatorFunction<T, R>;
+export function withLatestFrom<T, O2 extends ObservableInput<any>, O3 extends ObservableInput<any>, R>(v2: O2, v3: O3, project: (v1: T, v2: ObservedValueOf<O2>, v3: ObservedValueOf<O3>) => R): OperatorFunction<T, R>;
+export function withLatestFrom<T, O2 extends ObservableInput<any>, O3 extends ObservableInput<any>, O4 extends ObservableInput<any>, R>(v2: O2, v3: O3, v4: O4, project: (v1: T, v2: ObservedValueOf<O2>, v3: ObservedValueOf<O3>, v4: ObservedValueOf<O4>) => R): OperatorFunction<T, R>;
+export function withLatestFrom<T, O2 extends ObservableInput<any>, O3 extends ObservableInput<any>, O4 extends ObservableInput<any>, O5 extends ObservableInput<any>, R>(v2: O2, v3: O3, v4: O4, v5: O5, project: (v1: T, v2: ObservedValueOf<O2>, v3: ObservedValueOf<O3>, v4: ObservedValueOf<O4>, v5: ObservedValueOf<O5>) => R): OperatorFunction<T, R>;
+export function withLatestFrom<T, O2 extends ObservableInput<any>, O3 extends ObservableInput<any>, O4 extends ObservableInput<any>, O5 extends ObservableInput<any>, O6 extends ObservableInput<any>, R>(v2: O2, v3: O3, v4: O4, v5: O5, v6: O6, project: (v1: T, v2: ObservedValueOf<O2>, v3: ObservedValueOf<O3>, v4: ObservedValueOf<O4>, v5: ObservedValueOf<O5>, v6: ObservedValueOf<O6>) => R): OperatorFunction<T, R>;
+export function withLatestFrom<T, O2 extends ObservableInput<any>>(source2: O2): OperatorFunction<T, [T, ObservedValueOf<O2>]>;
+export function withLatestFrom<T, O2 extends ObservableInput<any>, O3 extends ObservableInput<any>>(v2: O2, v3: O3): OperatorFunction<T, [T, ObservedValueOf<O2>, ObservedValueOf<O3>]>;
+export function withLatestFrom<T, O2 extends ObservableInput<any>, O3 extends ObservableInput<any>, O4 extends ObservableInput<any>>(v2: O2, v3: O3, v4: O4): OperatorFunction<T, [T, ObservedValueOf<O2>, ObservedValueOf<O3>, ObservedValueOf<O4>]>;
+export function withLatestFrom<T, O2 extends ObservableInput<any>, O3 extends ObservableInput<any>, O4 extends ObservableInput<any>, O5 extends ObservableInput<any>>(v2: O2, v3: O3, v4: O4, v5: O5): OperatorFunction<T, [T, ObservedValueOf<O2>, ObservedValueOf<O3>, ObservedValueOf<O4>, ObservedValueOf<O5>]>;
+export function withLatestFrom<T, O2 extends ObservableInput<any>, O3 extends ObservableInput<any>, O4 extends ObservableInput<any>, O5 extends ObservableInput<any>, O6 extends ObservableInput<any>>(v2: O2, v3: O3, v4: O4, v5: O5, v6: O6): OperatorFunction<T, [T, ObservedValueOf<O2>, ObservedValueOf<O3>, ObservedValueOf<O4>, ObservedValueOf<O5>, ObservedValueOf<O6>]>;
+export function withLatestFrom<T, R>(...observables: Array<ObservableInput<any> | ((...values: Array<any>) => R)>): OperatorFunction<T, R>;
+export function withLatestFrom<T, R>(array: ObservableInput<any>[]): OperatorFunction<T, R>;
+export function withLatestFrom<T, R>(array: ObservableInput<any>[], project: (...values: Array<any>) => R): OperatorFunction<T, R>;
+
+/* 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>
+ *
+ * 
+ *
+ * `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
+ * On every click event, emit an array with the latest timer event plus the click event
+ * ```ts
+ * import { fromEvent, interval } from 'rxjs';
+ * import { withLatestFrom } from 'rxjs/operators';
+ *
+ * const clicks = fromEvent(document, 'click');
+ * const timer = interval(1000);
+ * const result = clicks.pipe(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.pipe(withLatestFrom(b, c), map(([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<T, R>(...args: Array<ObservableInput<any> | ((...values: Array<any>) => R)>): OperatorFunction<T, R> {
+ return (source: Observable<T>) => {
+ let project: any;
+ if (typeof args[args.length - 1] === 'function') {
+ project = args.pop();
+ }
+ const observables = <Observable<any>[]>args;
+ return source.lift(new WithLatestFromOperator(observables, project));
+ };
+}
+
+class WithLatestFromOperator<T, R> implements Operator<T, R> {
+ constructor(private observables: Observable<any>[],
+ private project?: (...values: any[]) => Observable<R>) {
+ }
+
+ call(subscriber: Subscriber<R>, source: any): any {
+ return source.subscribe(new WithLatestFromSubscriber(subscriber, this.observables, this.project));
+ }
+}
+
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+class WithLatestFromSubscriber<T, R> extends OuterSubscriber<T, R> {
+ private values: any[];
+ private toRespond: number[] = [];
+
+ constructor(destination: Subscriber<R>,
+ private observables: Observable<any>[],
+ private project?: (...values: any[]) => Observable<R>) {
+ super(destination);
+ 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<T, R>(this, observable, <any>observable, i));
+ }
+ }
+
+ notifyNext(outerValue: T, innerValue: R,
+ outerIndex: number, innerIndex: number,
+ innerSub: InnerSubscriber<T, R>): void {
+ 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
+ }
+
+ protected _next(value: T) {
+ if (this.toRespond.length === 0) {
+ const args = [value, ...this.values];
+ if (this.project) {
+ this._tryProject(args);
+ } else {
+ this.destination.next(args);
+ }
+ }
+ }
+
+ private _tryProject(args: any[]) {
+ let result: any;
+ try {
+ result = this.project.apply(this, args);
+ } catch (err) {
+ this.destination.error(err);
+ return;
+ }
+ this.destination.next(result);
+ }
+}
projects / dotfiles / .git / blobdiff