unity how does layermask work code example

Example 1: collider layer = to layermask unity

layermask == (layermask | (1 << layer))

Example 2: unity get layermask

int layer = (int)Mathf.Log(uninteractablePartsLayer.value, 2);
Debug.Log("uninteractablePartsLayer "+LayerMask.LayerToName(layer));