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Discussion on: Grokking Traversable

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Mohamed Dahir •

Wonderful post just like the rest of the series.

I think I have noticed a small error in the first code snippet after An Applicative clean up 🧽 which uses sequence instead of invert

let rec invert list =
    // An alias for :: so we can pass it as a function below
    let cons head tail = head :: tail

    match list with
    | head :: tail -> Some cons |> apply head |> apply (sequence tail)
    | [] -> Some []
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Matt Thornton •

Thanks for pointing that out. You’re right. And thanks for the kind words.

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Matt Thornton •

Fixed 🔨👍