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Going functional and immutable: Refactoring solution (...) from C# to F# -Daniel Ondus |LambdaDays25

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Source: CodeSync
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  • description: ✨ This talk was recorded at Lambda Days in June 2025. If you're curious about our upcoming event, check https://lambdadays.org ✨ Going functional and immutable: Refactoring solution with 30k+ loc from C# to F# Our employee roster scheduling optimization solution was gradually built in C# based on the needs of particular customers. The whole data processing and optimization procedure resembles a functional pipeline, therefore F# was introduced as natural choice for some parts. After 10 years of development the solution reached a point of C#-F# interop mess and it was time to tidy it up. In my talk I'll guide you through our process of eliminating side-effect bugs by transition to data representation interface implemented by F# immutable records while relying on unit tests based on real production scenarios. Let's keep in touch! Follow us on: 💥BlueSky: https://bsky.app/profile/lambdadays.bsky.social 💥LinkedIn: https://www.linkedin.com/company/lambda-days 💥Facebook: https://www.facebook.com/lambdadays 💥Mastodon: https://genserver.social/codesync 💥Twitter: https://twitter.com/LambdaDays
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  • title: Going functional and immutable: Refactoring solution (...) from C# to F# -Daniel Ondus |LambdaDays25
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