You Used To Inject Me In Your Constructor

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You Used To Inject Me In Your Constructor - Functional Programming In Swift

Transcript of You Used To Inject Me In Your Constructor

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You Used To Inject Me In Your Constructor

- Functional Programming In Swift

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Hello, I’m Veronica Ray!

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–Dependency Injection Demystified

“Dependency injection means giving an object its

instance variables. Really.

That's it.”

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WHY

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WHY•Clear declaration of dependencies

•Composition •Easy customization

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WHY

•Clear ownership

•Testability

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FRAMEWORK

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LAYER OF ABSTRACTION

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SUPER LINEAR

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SMART FRAMEWORKS

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LAZY EVALUATION

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–HaskellWiki

“…expressions are not evaluated when they are

bound to variables, but their evaluation is deferred until their results are needed by

other computations. ”

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–HaskellWiki

“…Pure computations ..can be performed at any time and still yield the same

result.

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–HaskellWiki

“This makes it possible to defer the computation of

values until they are needed, that is, to compute

them lazily. ”

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Lazy evaluationBrought to you by functional programming

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MEMOIZATION

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–Python 3 Tutorial

“ If the same input or a function call with the same

parameters is used, the previously stored results can

be used again and unnecessary calculation are

avoided.”

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SCOPES

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TYPHOON

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TyphoonScopeSingletonTyphoonScopeLazySingleton

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SWINJECT

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ObjectScope.Container

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ISSUES

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WE NEED A RESOLUTION

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DI IN SWIFT

•constructor injection

•reader monad

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DI IN SWIFT

•constructor injection

•reader monad

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BearWithMeFind fiends to hibernate with

during the winter

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–In today’s post-OO world, is dependency injection still relevant?

“Currently we use the same mechanism – parameters – to define the environment

(e.g. via constructor parameters), as we use to

pass data around functions.”

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DI IN SWIFT

•constructor injection

•reader monad

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–Don’t Fear The Reader

“…if you break down common dependency

injection libraries they are just different

implementations of the Reader Monad pattern.”

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SIMPLE EXAMPLE

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DO NOTATION

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DESUGARED

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SWIFT

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BearWithMeFind fiends to hibernate with

during the winter

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IS THIS A GOOD IDEA?

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USE DEPENDENCY INJECTION

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LEARN MORE

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•Swiftz •Swift Injection •Nick Santos •objc.io •adit.io

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THANK YOU


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