Elm Radio

013: Make Impossible States Impossible

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The talks
  • Make Impossible States Impossible from Elm Conf 2016
  • Make Data Structures from Elm Europe 2018
  • Elm Radio Episode 2: Intro to Opaque Types
Dealing with Impossible States
  • Building up a "truth table" of possible states (see Evan's guide Types as Sets)
  • Which rows are invalid?
  • Create a new type with only the valid ones possible
More references

  • elm-css

  • Tereza's line-charts package

  • Tereza's elm Europe talk

  • elm-graphql

  • Gilded rose live stream

  • Snapshot testing (also called Approval Tests)

  • Jeremy Fairbank's Boolean Blindness talk

...more
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Elm RadioBy Dillon Kearns, Jeroen Engels
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