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Introduction. By default, Redux's actions are dispatched synchronously, which is a problem for any non-trivial app that needs to communicate with an external API or perform side effects. Redux also allows for middleware that sits between an action being dispatched and the action reaching the reducers.
By itself, a Redux store doesn't know anything about async logic. It only knows how to synchronously dispatch actions, update the state by calling the root reducer function, and notify the UI that something has changed. Any asynchronicity has to happen outside the store.
Dispatching actions in Redux is the fundamental method of updating a Redux store's state . Actions are used to store relevant information for the state , and they reach the store through the dispatch() method available on the store object. You can use either store. dispatch() directly or this. props.
Yes, by default dispatch() is 100% synchronous.
AFAIK, dispatching action is synchronous. In case if you are willing to address the asynchronous call, you can use the thunk-middleware in redux, where dispatch is provided as a callback function which you can invoke as per your convenience. For more info, checkout this answer on SO by Author itself: How to dispatch a Redux action with a timeout?
Nobody knows better than the code itself. =) As you can see dispatch is absolutely synchronous. The only warning here is that store enhancers can (and do) substitute dispatch method. For example, take a look at applyMiddleware enhancer, it lets you jack middlewares in by replacing default dispatch method with its own implementation. Though I never saw any Redux enhancer which would actually remove synchronous nature of dispatch.
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