Documentation

Fold a listlike container to a single summary result

run monoid ["a", "b", "c"] = "abc"

Rather than only obtain a single final result, scanning gives a running total that shows the intermediate result at each step along the way

scan monoid ["a", "b", "c"] = ["","a","ab","abc"]

Scan where the last input is excluded

prescan monoid ["a", "b", "c"] = ["","a","ab"]

Scan where the first input is excluded

postscan monoid ["a", "b", "c"] = ["a","ab","abc"]