Quick Answer: Why Do We Need Redux Thunk?

When should I use Redux saga?

When to use Redux Sagamake a HTTP call to a server.send a WebSocket event.fetch some data from a GraphQL server.save something to the cache or browser local storage.Feb 21, 2018.

What are side effects in react?

What are side effects? Side effects are basically anything that affects something outside of the scope of the current function that’s being executed.

What is Redux and how it works?

Redux is a predictable state container designed to help you write JavaScript apps that behave consistently across client, server, and native environments and are easy to test. While it’s mostly used as a state management tool with React, you can use it with any other JavaScript framework or library.

Why do we need Redux middleware?

In this case, Redux middleware function provides a medium to interact with dispatched action before they reach the reducer. … Each middleware receives store’s dispatch so that they can dispatch new action, and getState functions as arguments so that they can access the current state and return a function.

How do I use Redux thunk?

Set up middleware. Redux Thunk is a middleware – functionality that sits between actions and reducers that can change how those actions behave. … Set up action creators. … Create a thunk for loading. … Load data from the server. … Dispatch the thunk. … Add photos on success. … Set up the UI. … Add loading and error selector.More items…•Mar 6, 2019

What the heck is a thunk?

If you want an action to do something, that code needs to live inside a function. That function (the “thunk”) is a bundle of work to be done. … Update: As rixman mentions in the comments, the getState function can be useful for deciding whether to fetch new data, or return a cached result, depending on the current state.

What is redux saga vs thunk?

Thunk allows to write an action creators that return a function instead of the typical action object. Where as redux-saga is a library that mainly focuses on easy handling of application side effects and more efficient for execution.

Why do we need middleware?

Middleware helps developers build applications more efficiently. It acts like the connective tissue between applications, data, and users. For organizations with multi-cloud and containerized environments, middleware can make it cost-effective to develop and run applications at scale.

What is a thunk function?

Thunk is a function that wraps another function or expression to delay computation. Thunk can also be used to add additional calculations to a function. Thunks provide lazy evaluation and are widely used in functional programming languages.

What is use of Redux thunk?

Redux Thunk is a middleware that lets you call action creators that return a function instead of an action object. That function receives the store’s dispatch method, which is then used to dispatch regular synchronous actions inside the function’s body once the asynchronous operations have been completed.

Do we need Redux saga?

The reason that we need to use a middleware such as Redux-Thunk is because the Redux store only supports synchronous data flow. … Redux-Saga is a library that aims to make application side effects (e.g., asynchronous actions such as fetching data) easier to handle and more efficient to execute.

What is redux promise?

redux-promise “teaches” dispatch how to accept promises, by intercepting the promise and dispatching actions when the promise resolves or rejects. Normally, dispatch returns whatever action object was passed in. Because middleware wrap around dispatch , they can also change what value is being returned.