effect-ts-folds/src/util/Array.js

Recursion schemes for effect-ts.

import { Array as AR, flow, Number as NU, Option as OP, pipe } from 'effect';
/** Transpose a list of arrays. */
export const transpose = ([head, ...tail]) => head === undefined
    ? []
    : AR.isNonEmptyArray(tail)
        ? pipe([head, ...tail], padSuffix, transposePadded, AR.map(AR.getSomes))
        : pipe(head, AR.map(AR.of));
const padSuffix = (xss) => {
    const n = pipe([0, ...AR.map(xss, AR.length)], AR.max(NU.Order)) - 1;
    const f = (xs) => n <= 1
        ? xs
        : [
            ...xs,
            ...(n === xs.length - 1
                ? []
                : AR.replicate(OP.none(), n - xs.length)),
        ];
    return pipe(xss, AR.map(flow(AR.map(OP.some), f)));
};
const transposePadded = ([first, second, ...rest]) => first === undefined
    ? []
    : second === undefined
        ? pipe(first, AR.map(AR.of))
        : pipe(rest, AR.reduce(AR.zip(first, second), (p, c) => AR.zipWith(p, c, (AR.append))));
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