columns.ts

import { map, range2d } from "@thi.ng/transducers";
import { swapxy } from "./swap";

/**
 * Yields sequence of 2D grid coordinates in column-major order.
 *
 * @param cols
 * @param rows
 */
export const columns2d = (cols: number, rows = cols) =>
    map(swapxy, range2d(rows, cols));