Mark Seemann 11/24/2025

Result is the most boring sum type

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This article argues that the Result (or Either) type is the most basic and abstract sum type in functional programming, serving as a universal building block (coproduct) from which other sum types can be constructed. It explains that its apparent simplicity and similarity to exceptions can make it a confusing entry point for learning algebraic data types, suggesting learners might benefit from starting with more concrete examples instead.

Result is the most boring sum type

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