如何在第二个SwitchMap中返回2个响应对象并在subscribe方法中消费

Question

.pipe(
switchMap(x => { return this.clientService.A(); }), 
filter(firstResp => Helpers.IsNotNull(firstResp)),
switchMap(firstRep => { return this.clientService.B(firstResp.someProp); }),
).subscribe( 
//Want to access response of both services in subscribe method.

);

第一个SwitchMap正在返回服务A的响应，该响应将进入第二个SwitchMap。在这个Subscribe方法中，我需要使用两个switchMap响应。我怎样才能做到这一点？

注意-两种服务响应类型不同。

Answer 1

您可以嵌套管道：

.pipe(
switchMap(x => this.clientService.A()),
filter(firstResp => Helpers.IsNotNull(firstResp)),
switchMap(firstRep => this.clientService.B(firstResp.someProp)
.pipe(map(b => [firstRep, b]))),
).subscribe(([a, b]) => {
// stuff
});