Скачать или смотреть Shared State in Pure FP - JVM Roundabout - October 2019

Concurrent shared state (and effects in general) are not a weakness of pure FP, they're a strength.

Side effects are things that break referential
transparency.

1/0, state and so on are traditionally side effects, but don't have to be.

Referential transparency --) Local reasoning --)
Awesomeness

Fabio Labella (Principal Engineer) @ Ovo talking about a shared cache, a concurrent counter, a mutable DB connection: they are all common concerns in real-world applications that don't fit the state monad model of returning a new copy of the state each time. Does this mean we should drop pure FP in those cases? Of course not!

This talk will show how mutable, shared, concurrent state is not only possible, but very simple in pure FP, whilst remaining composable and easy to reason about.

On one hand, we will see how to put together several concepts such as the IO type, cats-effect Ref, and Final Tagless. On the other, we'll get at the very heart of what purity is all about.about.

Fabio is highly respected within Scala. Checkout his Github here: https://github.com/SystemFw

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