![]() ![]() But before that, we need to understand the Observer Pattern. This article covers the basics of RxJS, how to setup Redux-Observables, and some of its practical use-cases. It's an alternative to redux-thunk and redux-saga. Fetch function is called only if the value is not falsy else an empty array will be sent back.Redux-Observable is an RxJS-based middleware for Redux that allows developers to work with async actions. ![]() The function to be applied in our case is the HTTP request made using fetch API that takes URL endpoint input and sends back a JSON response. MergeMap: returns an observable that emits values by applying a specific function, it is the combination between mergeAll and map. This allows us to retrieve from target event only text valueĭebounceTime: returns an observable that emits values after only a particular time span in ms has passed without another source emission.ĭistinctUntilChanged: returns an observable that emits values only if it is different from the previous one. Map: returns an observable by applying a project function to each value emitted by the source observable. Therefore we are going to use the pipe function to apply the required functionality to the observable stream. In autocomplete feature, usually, we don't send HTTP request for each character, in other words, we wait an amount of time to see if the user add another character to the input, also, we don't send similar requests in a row to get better performance. Now we are listening to inputTxt, whatever key is typed an event will be fired. ![]() Enter fullscreen mode Exit fullscreen mode ![]()
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