~/talk

Live Coding Eff in Anger

on YouTube 55m
Talkat LambdaConf 2018 · 2018-06-03..06-05· [machine-learning]

speakers

name:Arnaud Baily
links:none on file
name:Jan Christopher Vogt
links:none on file

resources

video:https://youtu.be/3qnblgj4MYo
slides:none on file

summary

Live-coding shows building a Pet Store REST service using the Eff monad from the freer package, wiring Servant/Warp handlers into an effect stack, writing interpreters like runPetStore and runInMemoryDatabase, and swapping a failing DB interpreter to exercise error paths; tests move from IO to F and are fixed live, demonstrating composable handlers and an ability to mock subsystems. Measured overhead for the plumbing is about 5–10%, and the final demo compiles and exercises HTTP error translation.

AI-written summary · about

chapters (6)

  1. 0:00Live coding intro
  2. 3:29Servant handlers to effects
  3. 15:37Database persistence with effects
  4. 31:50Handling DB failures
  5. 38:57Layered architecture thoughts
  6. 43:13Q&A

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