THE DISCIPLINE OF CONSTRAINTS: WHAT ELM TAUGHT ME ABOUT REACT'S USEREDUCER

Summary from the TLDR Dev newsletter

Elm has strictly enforced constraints, while React gives developers a lot of freedom to make mistakes. While both Elm and React solve state management through similar patterns, Elm's compiler prevents errors like unhandled cases and improper effect management, whereas React allows developers to use escape hatches like default cases and loose typing that can lead to bugs. Elm's constraints teach valuable discipline that can be intentionally applied to React development through practices like strict typing, proper action handling, and designing invalid states out of existence.