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paavohtl
on Aug 31, 2020
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Sum Types in Julia and Rust
It is possible (and popular) to have sum types in TypeScript by manually adding a tag, though.
type Maybe<T> = | { kind: "Some", value: T } | { kind: "None" }
carlmr
on Aug 31, 2020
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This is also why sum types are often referred to as tagged unions. They are a special case of a union, in Rust's case with support from the type system.
a_humean
on Aug 31, 2020
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Yep, Typescript's control flow analysis, type literals, and union types allow us have tagged unions/sum types. Probably its best feature.
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