isContains method
Implementation
bool? isContains(List<dynamic>? list, dynamic e) {
if (list != null && widget.funcOfItemIsEqual != null) {
int len = list.length;
for (int i = 0; i < len; i++) {
if (widget.funcOfItemIsEqual?.call(this, i, list.elementAt(i), e) ?? false) {
return true;
}
}
}
return list?.contains(e);
}