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x/evt/lib/util/genericOperators/scan.ts

💧EventEmitter's typesafe replacement
garronej/evt
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import { compose } from "../compose.ts";
export const scan = <T, U>(    accumulator: (acc: U, value: T, index: number) => U,    seed: U) => compose<T, [T, U, number], U>(    [        (data, [, acc, index]) =>            [[data, accumulator(acc, data, index), index + 1]],        [null as any, seed, 0]    ],    ([, acc]) => [acc]);