Fearless Refactoring in Elm
summary
Strongly typed Elm code plus the Elm compiler actually prevents whole classes of runtime errors, uses Maybe/Just pattern matching and custom union types to force exhaustiveness, and rejects debug-only crashes from making it into production. The demo refactors hundreds of lines, recompiles in seconds, and a real product called self reviews compiles and runs after the change. A surprising claim: JavaScript apps saw roughly 60,000 distinct production error types versus Elm’s far smaller surface.
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