getNthInRelationToXByItem method

T? getNthInRelationToXByItem(
  1. T item,
  2. int nth
)

Implementation

T? getNthInRelationToXByItem(T item, int nth) {
  var index = this.indexOf(item);
  var nthIndex = index + nth;

  if (nthIndex < 0 || nthIndex >= this.length) //
    return null;

  var previousItem = this.elementAt(nthIndex);
  return previousItem;
}