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What happen if I have multiple middleware (lets say 3 for the exemple), all catching a single action ? Do they trigger in the order defined in the store creation ?
createStore(reducer,applyMiddleware(middle1, middle2, middle3));
middle1 will get triggered first, then middle2, then middle3 ? (when calling next() ) Can I on a specific action force middle3 to be called before middle2 ?
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Here is the pseudo code. Redux calls middleware w/ , “dispatch”(function) and “next”(function) and the “action” JSON object.
Multiple middleware can be combined together, where each middleware requires no knowledge of what comes before or after it in the chain. The most common use case for middleware is to support asynchronous actions without much boilerplate code or a dependency on a library like Rx.
You can simply pass the middlewares in the comma separated manner like the following code: const store = createStore(reducer, applyMiddleware(thunk, logger)); Note: Please import the applyMiddlware, thunk, and logger at the top.
Redux thunk is the most popular middleware that allows you to call action creators, which then returns a function instead of an action object.
The middleware pipeline exactly matches the order that you passed to applyMiddleware(). So, in that example:
store.dispatch() passes the action to middle
middle1 calls next(action), it goes to middle2
middle2 calls next(action), it goes to middle3
middle3 calls next(action), it goes to the actual store and the reducer logic is executedAnd no, you cannot reorder middleware after the store has been created.
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