Functional Core Imperative Shell Speaker Deck

Functional Core, Imperative Shell - Speaker Deck

Functional Core, Imperative Shell - Speaker Deck Clean architecture and gary bernhardt's functional core, imperative shell. they are all the same. this presentation will simplify and clarify an architecture that so many people have "discovered" independently. it is an architecture that decouples an application's core logic from the services it uses. The functional core, imperative shell pattern is just so exciting! this pattern enables us to use functional programming for what it does the best, and to use imperative programming for all the messy, mutable, side effectful stuff that most applications also need to do.

Functional Core, Imperative Shell - Speaker Deck

Functional Core, Imperative Shell - Speaker Deck This article presents my findings on the matter, more specifically, how the functional core and imperative shell pattern can be used to get the best of both worlds. You can build every actor like a miniature program, with its own imperative shell and functional core. in erlang it's common to have various message handlers that are very imperative, but defer all complicated logic to pure functions that take part of the actor state and return a transformed state. The imperative shell orchestrates all the impure effects that a software needs to be able to interact with the outside world. it takes inputs from the external world (e.g., user input, network requests) and orchestrates how those inputs flow into the functional core. The core contains no dependencies, but encapsulates the different logic paths. so we’re encapsulating dependencies on one side, and business logic on the other side.

Functional Core, Imperative Shell - Speaker Deck

Functional Core, Imperative Shell - Speaker Deck The imperative shell orchestrates all the impure effects that a software needs to be able to interact with the outside world. it takes inputs from the external world (e.g., user input, network requests) and orchestrates how those inputs flow into the functional core. The core contains no dependencies, but encapsulates the different logic paths. so we’re encapsulating dependencies on one side, and business logic on the other side. We review a twitter client whose core is functional: managing tweets, syncing timelines to incoming twitter api data, remembering cursor positions within the tweet list, and rendering tweets to text for display. One technique that can help us get there is called the "functional core, imperative shell". as the name says, the idea is to separate the effectful, imperative code into the outer shell and keep the inner core pure (functional core). One of the things shown by his diagrams is how the programs break down into a pure part and an i/o part, i.e. into a functional core and an imperative shell. The diagram shows how user input initiates the imperative shell, which uses pure functions from the functional core. the results are then used to update the database or perform io operations.

Functional Core, Imperative Shell - Speaker Deck

Functional Core, Imperative Shell - Speaker Deck We review a twitter client whose core is functional: managing tweets, syncing timelines to incoming twitter api data, remembering cursor positions within the tweet list, and rendering tweets to text for display. One technique that can help us get there is called the "functional core, imperative shell". as the name says, the idea is to separate the effectful, imperative code into the outer shell and keep the inner core pure (functional core). One of the things shown by his diagrams is how the programs break down into a pure part and an i/o part, i.e. into a functional core and an imperative shell. The diagram shows how user input initiates the imperative shell, which uses pure functions from the functional core. the results are then used to update the database or perform io operations.

Functional Core Imperative Shell - Janmeppe.com 👋

Functional Core Imperative Shell - Janmeppe.com 👋 One of the things shown by his diagrams is how the programs break down into a pure part and an i/o part, i.e. into a functional core and an imperative shell. The diagram shows how user input initiates the imperative shell, which uses pure functions from the functional core. the results are then used to update the database or perform io operations.

The Functional Core, Imperative Shell Pattern – Kenneth Lange

The Functional Core, Imperative Shell Pattern – Kenneth Lange

Moving IO to the edges of your app: Functional Core, Imperative Shell - Scott Wlaschin