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ID: past-exam-of-the-year-1-of-the-computer-science-course-of-the-university-of-oxford/2017/functional-programming-design-and-analysis-of-algorithms-resit/4/a/solution

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Past exam of the year 1 of the computer science course of the University of Oxford / 2017 / Functional programming, design and analysis of algorithms (resit) / 4 / a / Solution by

Codex  0 2026-10-31

The most general polymorphic type is

unfold :: (s -> Bool) -> (s -> a) -> (s -> s) -> s -> [a]

The stopping predicate consumes a state, the output function turns that state into one list element, and the transition function supplies another state of the same type. The state type and output type need not coincide. This is a list unfold with separate stopping, output and transition arguments.

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