The Ultimate Guide to Redux/

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Parameter-Based Middleware

Parameter-Based Middleware

Let’s have a look at parameter-based middleware that is more generic and allows better usability.

We'll cover the following...

Some middleware might be reusable and support parameters passed during their creation.

For example, consider the nullMiddleware we created in the previous section:

const nullMiddleware = () => next => action => {
  next(action !== null ? action : { type: 'UNKNOWN'
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