> the function doesn't care about the type, but just whether it implements a... | Hacker News

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dons on June 20, 2012 | parent | context | favorite | on: Experiment: Unit testing isn't enough; You need st...

> the function doesn't care about the type, but just whether it implements a next() method?

You're describing an "existential" type.

dllthomas on June 20, 2012 [–]

... or a typeclass.

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