row-ends.ts

import { asInt } from "@thi.ng/api/typedarray";

/**
 * Filtered version of {@link rows2d}, only including end points of
 * each row.
 *
 * @param cols -
 * @param rows -
 */
export function* rowEnds2d(cols: number, rows = cols) {
	[cols, rows] = asInt(cols, rows);
	cols--;
	for (let y = 0; y < rows; y++) {
		yield [0, y];
		yield [cols, y];
	}
}