TypeScript map.map類代碼示例

export function waitForMap<A, B>(
    obj: {[k: string]: A}, fn: (k: string, a: A) => Observable<B>): Observable<{[k: string]: B}> {
  const waitFor: Observable<B>[] = [];
  const res: {[k: string]: B} = {};

  forEach(obj, (a: A, k: string) => {
    if (k === PRIMARY_OUTLET) {
      waitFor.push(map.call(fn(k, a), (_: B) => {
        res[k] = _;
        return _;
      }));
    }
  });

  forEach(obj, (a: A, k: string) => {
    if (k !== PRIMARY_OUTLET) {
      waitFor.push(map.call(fn(k, a), (_: B) => {
        res[k] = _;
        return _;
      }));
    }
  });

  if (waitFor.length > 0) {
    const concatted$ = concatAll.call(of (...waitFor));
    const last$ = l.last.call(concatted$);
    return map.call(last$, () => res);
  } else {
    return of (res);
  }
}

export function listenForStoreChanges(router: Router, store: Store<any>) {
  const storeAndRouter$ = withLatestFrom.call(selectRouter(store), getLatestUrl(router));
  const mismatch$ = filter.call(storeAndRouter$, ([ rs, url ]) => rs.path !== url);
  const newPath$ = map.call(mismatch$, ([ rs ]) => rs.path);

  newPath$.subscribe(url => router.navigateByUrl(url));
}

 forEach(obj, (a: A, k: string) => {
   const mapped = map.call(fn(k, a), (r: B) => res[k] = r);
   if (k === PRIMARY_OUTLET) {
     waitHead.push(mapped);
   } else {
     waitTail.push(mapped);
   }
 });

export function connectRouterActions(router: Router, store: Store<any>) {
  const routerAndStore$ = withLatestFrom.call(getLatestUrl(router), selectRouter(store));
  const mismatchUrl$ = filter.call(routerAndStore$, ([ url, rs ]) => (rs && rs.path !== url || !rs));
  const updateLocation$ = map.call(mismatchUrl$, ([ path ]) => {
    return { type: routerActions.UPDATE_LOCATION, payload: { path }};
  });

  updateLocation$.subscribe(store);
}

      (source$: GroupedObservable<any, any>) =>
        dematerialize.call(
          map.call(
            exhaustMap.call(source$, resolveEffectSource),
            (output: EffectNotification) => {
              verifyOutput(output, this.errorReporter);

              return output.notification;
            }
          )
        )

      (source$: GroupedObservable<any, any>) =>
        dematerialize.call(
          filter.call(
            map.call(
              exhaustMap.call(source$, resolveEffectSource),
              (output: EffectNotification) => {
                verifyOutput(output, this.errorHandler);

                return output.notification;
              }
            ),
            (notification: Notification<any>) => notification.kind === 'N'
          )
        )

export function select<T, R>(pathOrMapFn: any, ...paths: string[]): Observable<R> {
  let mapped$: Observable<R>;

  if (typeof pathOrMapFn === 'string') {
    mapped$ = pluck.call(this, pathOrMapFn, ...paths);
  }
  else if (typeof pathOrMapFn === 'function') {
    mapped$ = map.call(this, pathOrMapFn);
  }
  else {
    throw new TypeError(`Unexpected type ${ typeof pathOrMapFn } in select operator,`
      + ` expected 'string' or 'function'`);
  }

  return distinctUntilChanged.call(mapped$);
}

  return function selectOperator(source$: Store<T>): Store<K> {
    let mapped$: Store<any>;

    if (typeof pathOrMapFn === 'string') {
      mapped$ = pluck.call(source$, pathOrMapFn, ...paths);
    } else if (typeof pathOrMapFn === 'function') {
      mapped$ = map.call(source$, pathOrMapFn);
    } else {
      throw new TypeError(
        `Unexpected type '${typeof pathOrMapFn}' in select operator,` +
          ` expected 'string' or 'function'`
      );
    }

    return distinctUntilChanged.call(mapped$);
  };

  load(parentInjector: Injector, route: Route): Observable<LoadedRouterConfig> {
    if (this.onLoadStartListener) {
      this.onLoadStartListener(route);
    }

    const moduleFactory$ = this.loadModuleFactory(route.loadChildren !);

    return map.call(moduleFactory$, (factory: NgModuleFactory<any>) => {
      if (this.onLoadEndListener) {
        this.onLoadEndListener(route);
      }

      const module = factory.create(parentInjector);

      return new LoadedRouterConfig(flatten(module.injector.get(ROUTES)), module);
    });
  }