Question

我正在寻找一种使用RxJS的管道运算符来改进现有代码的方法。

代替此：

export const initialState = {}

export const createReducerActions = (
    actionType => ({
        [actionType]: (
            (prevState, { data }) => (
                data
            )
        ),
    })
)

const createDataStorageReducer = (
    actionType => (
        createReducer(
            (
                createReducerActions(
                    actionType,
                )
            ),
            (
                initialState
            ),
        )
    )
)

我正在寻找RxJS中是否存在某种executeImmediately函数，如下所示：

export const initialState = {}

export const createReducerActions = (
    actionType => ({
        [actionType]: (
            (prevState, { data }) => (
                data
            )
        ),
    })
)

const createDataStorageReducer = (
    actionType => (
        of(actionType)
        .pipe(
            map(createReducerActions),
            map(reducerActions => (
                createReducer(
                    reducerActions,
                    initialState,
                )
            ))
        )
        .executeImmediately()
    )
)

Answer 1

您不会同时获取Observable的值。您获得的最接近的结果是创建一个BehaviorSubject，并将其订阅到Observable。然后，您可以同步获取BehaviorSubject的值。

console.log(typeof(rxjs.BehaviorSubject));

const o = rxjs.interval(1000);
const bs = new rxjs.BehaviorSubject("hello");

bs.subscribe(v => console.log(v));
o.subscribe(bs);

bs.next("world");

// You can get the current value of a BS with getValue()
console.log(`bs value right now is: ${bs.getValue()}`);

setTimeout(() => {
  console.log(`bs value after 3 seconds is: ${bs.getValue()}`);
}, 3000);

<script src="https://unpkg.com/rxjs@6.2.2/bundles/rxjs.umd.min.js"></script>

没有.subscribe方法，是否可以从RxJS获取值？

1 个答案: