recompose VS reselect

React was literally first created in ML out if the author's dislike of MVC, who preferred functional programming and immutability. For a long time, react aspired for its future to be in ReasonML.

Hooks came as no surprise to anyone who paid attention, as the recommended way to write components since at least 2016 was in the stateless functional style whenever possible, and many of us used recompose[1] to simulate hooks long before their introduction.

[1] https://github.com/acdlite/recompose

Maybe take a look at the recompose project. https://github.com/acdlite/recompose https://medium.zenika.com/react-hooks-my-introduction-81b15e6eff20

A lot of stuff from functional programming are used in react. Hooks were basically recompose: https://github.com/acdlite/recompose

For those curious this is the result of using recompose

I am using recompose in my React projecthttps://github.com/acdlite/recompose/

Should I dispatch a separate action like SELECT_LIST_ITEM in componentWillReceiveProps e.g (using recompose):

Along with classes you'll also gonna need to learn how people achieved composition before hooks. Namely higher order components. You may also want to checkout js library https://github.com/acdlite/recompose which was often used in tandem with higher order components.

And in the end, you will need to compose your app with all that HOCs. For that, I like to use the Recompose library. It has other powerful uses, but for now we will use only the compose.

Using libraries like recompose

I might look like an asshole, but that also can save you time on future work: recompose includes withState and many other HOCs

- Throws better errors in an RSC environment

- https://github.com/reduxjs/react-redux/releases/tag/v9.0.0

## Reselect 5.0:

- Switches to a new `weakMapMemoize` memoizer as default

- Renames `defaultMemoize` to `lruMemoize`

- Allows passing memoizer options direct to `createSelector`

- Many TS improvements

- https://github.com/reduxjs/reselect/releases/tag/v5.0.1

## Redux Thunk 3.0:

- Drops the default export and switches to named exports ( `{thunk, withExtraArgument}` )

- https://github.com/reduxjs/redux-thunk/releases/tag/v3.1.0

This has been a _huge_ year-long development effort!

We're thrilled to get these improvements out. The tooling and bundle improvements will help all users, and we think the features and TS changes will improve the Redux dev experience significantly.

Thank you SO MUCH to everyone who has contributed or helped test out the work!

Please file bug reports for the inevitable issues that pop up post-release!

but now I'm going off on a conf trip and going to take a very well-earned break from Redux work for December :)

reselect -> For making faster queries to store.

Reselect solves this problem by memorizing the values and only passing what’s necessary.

In addition, diagnosing bugs in how data flowed through the application (where data originated from, how it was changed, etc.) was always super painful because I had to backtrack through selectors referencing selectors referencing selectors. And updating high-level selectors risked breaking something else down the line (even with 100% business logic coverage this was a problem). (This may be chalked up to improper usage of reselect, but I'm curious to hear your thoughts. Is this a common problem?)

reselect : Selector library to optimize your store access

Reselect documentation:

Applying memoization to TypeScript and ReactJS is relatively straightforward. There are several libraries available that provide memoization functionality, such as memoize function from Lodash, reselect or hooks from ReactJS. These libraries can be installed using NPM or Yarn and used in your TypeScript and ReactJS projects.

Generally, all you would need is to have your redux store provider at the very top level of your application (You could also only wrap the components that you want to have this data available to). Then, any component rendered inside that provider can get access to the redux store. The suggested approach ever since hooks were released is to use `useSelector` and `useDispatch` within your component to get the state data that you need. Using a selector library like Reselect is prevalent and keeps your data selection tidy & handles memoization for you.

Reselect is a library for creating memoized “selector” functions. Commonly used with Redux, to slice state and provide just the necessary subtree to a React component.