Modular iOS Architecture @ Just Eat

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Modular iOS Architecture @ Just Eat Alberto De Bortoli

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A modular architecture is a software design technique that emphasises separating the functionality of a program into independent, interchangeable modules, such that each one contains everything necessary to execute only one aspect of the desired functionality. MODULAR ARCHITECTURE

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AGENDA ▸ A bit of Just Eat history ▸ Challenges ▸ Learnings & advice

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TIMELINE The Big Fork Single global platform work starts Modularization is completed Early 2014 June 2016 October 2019

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“Integrate people first, technology later” Adam Gilmore Head of Engineering @ Just Eat

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The iOS Team (a.k.a. the best team evah)

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Your friends: the (product|delivery) managers

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2014 2016 2018 2019

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CocoaPods-based

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AVOID DEPENDENCY HELL ▸ The dependency issue arises around shared libraries on which other libraries have dependencies but where they depend on different and incompatible versions ▸ Sometimes duplication is better ▸ Low-level code shouldn’t change frequently, and our code changes frequently by deﬁnition

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▸ A ﬂat dependency graph allows Xcode to parallelize the build process. source: https://patrickbalestra.com/ FLATTENED OUT DEPENDENCY GRAPH

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▸ Not an easy task! FLATTENED OUT DEPENDENCY GRAPH

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THINK OPEN-SOURCE ▸ README ▸ Easy to integrate ▸ Tests ▸ Reasonably shaped code

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THINK OPEN-SOURCE ▸ README ▸ Easy to integrate ▸ Tests ▸ Reasonably shaped code “I don't wanna use this library because it's not in MVVM.” - said nobody ever

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DON'T BE FUSSY ABOUT (A SPECIFIC) ARCHITECTURE ▸ It's simply inevitable that different developers prefer different kinds of architecture ▸ Best to evangelise SOLID, Dependency Injection, Inversion of Control and all that jazz MVVM VIPER MVC MVP MVVM-C ELM

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▸ Only run the code you are working on ▸ Fast compilation times ▸ Jump straight to the desired features ▸ Get it for free with $ pod lib create DEMO APPS

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REFERENCES ▸ Personal Twitter: @albertodebo ▸ Personal blog: albertodebortoli.com ▸ Just Eat blog: tech.just-eat.com ▸ Modular iOS Architecture @ Just Eat albertodebortoli.com/2019/12/19/modular-ios-architecture-at-just-eat ▸ iOS @ Scale(ish) by Bradley Smith @ Wayfair appdevcon.nl/session/ios-at-scaleish ▸ Improving Your Build Time in Xcode 10 patrickbalestra.com/blog/2018/08/27/improving-your-build-time-in-xcode-10.html