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Learning to love f#

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This talk is a lighthearted look at how EROAD learned to love F#

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Learning to love f#

  1. 1. Dr FunctionalLove or: How EROAD learned to stop worrying and love F# Jim Bennett Senior Cloud Developer Advocate - Microsoft @jimbobbennett
  2. 2. Once upon a time there was a company in New Zealand called EROAD… @jimbobbennett
  3. 3. EROAD built hardware for trucks, and a SaaS platform that used data from that hardware @jimbobbennett
  4. 4. EROAD had a 2-person mobile team @jimbobbennett
  5. 5. They were the odd ones out - the rest of the company built services and web sites in Java, HTML and JavaScript @jimbobbennett
  6. 6. But they built Android apps in C# using Xamarin @jimbobbennett
  7. 7. And they loved F#! @jimbobbennett
  8. 8. One day, they needed to build a new app on iOS and Android @jimbobbennett
  9. 9. They wanted to use Xamarin.Forms with a C# UI layer and an F# model layer @jimbobbennett
  10. 10. So they went to see THE ARCHITECT @jimbobbennett
  11. 11. And guess what he said… @jimbobbennett
  12. 12. Our two trusty developers knew his reasons were not correct… @jimbobbennett
  13. 13. So they hatched a plan… @jimbobbennett
  14. 14. Phase #1 @jimbobbennett
  15. 15. The old app used PowerShell for build scripts @jimbobbennett
  16. 16. They needed build scripts for their new app, so they used FAKE @jimbobbennett
  17. 17. They then justified it to the architect @jimbobbennett
  18. 18. That meant F# was in production… @jimbobbennett
  19. 19. Phase #2 @jimbobbennett
  20. 20. EROAD Hackathon! 24 hours to build something, no rules on tech… @jimbobbennett
  21. 21. They used Xamarin.Forms with a C# UI layer and an F# model layer @jimbobbennett
  22. 22. It was an almost production ready app in 24 hours @jimbobbennett
  23. 23. If they released it - F# would be in a production app! @jimbobbennett
  24. 24. Bonus Phase… @jimbobbennett
  25. 25. The architect left! @jimbobbennett
  26. 26. Phase #3 @jimbobbennett
  27. 27. They ported their F# model code to their production app @jimbobbennett
  28. 28. They justified it to their boss… @jimbobbennett
  29. 29. They justified it to their boss… @jimbobbennett
  30. 30. They justified it to their boss… @jimbobbennett
  31. 31. Who said… @jimbobbennett
  32. 32. Yes! @jimbobbennett
  33. 33. They had F# inside an app on the iOS App Store and Google Play Store @jimbobbennett
  34. 34. This inspired conversations @jimbobbennett
  35. 35. They learnt things… @jimbobbennett
  36. 36. There are different ways to use F# @jimbobbennett
  37. 37. Once it is in production it’s easier to justify using it again @jimbobbennett
  38. 38. Use it for small pieces first - easy to replace if it goes wrong @jimbobbennett
  39. 39. Work for a company that values their developers @jimbobbennett
  40. 40. Wait for the naysayers to leave! @jimbobbennett
  41. 41. If all else fails – do it anyway then ask for forgiveness! @jimbobbennett
  42. 42. No architects were harmed in the making of these slides. The old head of architecture at EROAD is NOT evil, is a really nice chap and was totally justified in his hesitation to adopt an unknown technology. We love you Jordan! Jim Bennett Senior Cloud Developer Advocate - Microsoft @jimbobbennett jimbobbennett.io Sam Williams Development team lead - EROAD @willsam100 codingwithsam.com

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