Glide.fold_gen

You're seeing just the function fold_gen, go back to Glide module for more information.
Link to this function

fold_gen(docs, folder_fun)

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iex> Glide.fold_gen(["1","2","3"], fn doc, acc ->
...>   Glide.concat([doc, "!", acc])
...> end) |> Glide.val
"1!2!3"