@thi.ng/grid-iterators/zigzag-rows.js

2D grid and shape iterators w/ multiple orderings

import { __opts } from "./utils.js";
function* zigzagRows2d(opts) {
  const { cols, rows, tx } = __opts(opts);
  const num = cols * rows;
  for (let i = 0; i < num; i++) {
    let x = i % cols;
    const y = i / cols | 0;
    y & 1 && (x = cols - 1 - x);
    yield tx(x, y);
  }
}
export {
  zigzagRows2d
};