t-eckert

/* # Unpacking array weirdness
 *
 * I recreated the problem you were seeing with your JavaScript.
 * The root cause of the issue is `gridline` is a reference to an array.
 * It is that reference that is being copied into the `gameGridArray`.
 *
 * Let's walk through the offending code step-by-step and see what's happening.
 */

let gridline = new Array(4).fill(0); // The `gridline` object is being initialized with 4 zeros.