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Cats Core, Part 7: Eq and the Comparisons == Lets Through

Scala's == compares any two values, so a TodoId against a String compiles and returns false. Cats' Eq makes that a type error, explains why Some(1) === None fails, and lets me decide which fields count as equal.

23 Oct 2026 · 5 min read ·49 views

#cats-core
#eq
#functional-programming
#scala
#type-classes