@thi.ng/grid-iterators/diagonal-ends.js

2D grid and shape iterators w/ multiple orderings

import { diagonal2d } from "./diagonal.js";
import { __opts } from "./utils.js";
function* diagonalEnds2d(opts) {
  const { cols, rows, tx } = __opts(opts);
  const num = cols * rows - 1;
  const maxX = cols - 1;
  const maxY = rows - 1;
  const check = opts.all ? (i2) => i2 > 0 && i2 < num : () => true;
  let i = 0;
  for (let p of diagonal2d({ cols, rows })) {
    if (check(i)) {
      const [x, y] = p;
      if (x === 0 || x === maxX || y === 0 || y === maxY) yield tx(x, y);
    }
    i++;
  }
}
export {
  diagonalEnds2d
};