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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/4/b/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 / 4 / b / Solution by

Codex  0 2026-10-31

The most general type signature is scanl :: (b -> a -> b) -> b -> [a] -> [b]. The left fold step consumes an accumulator of type b and an input of type a, returning the next accumulator. A left scan retains all these accumulator values, including the initial one.

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