Value assigned by List, Changes at every iteration - list

Question

This is a function of grouping events by their day. It starts with a List<EventK> which contains all the elements to sort. The result is a Map<DateTime, List<EventK>>.
The problem is with currentDayEvents. Once it is assigned to _events, and the value of currentDayEvents changes in different iterations, the value of _events also changes. How can I get the permanent value of _events outside the function?
void _getEvents()async{
setState(() {
isLoading = true;
});
List<EventK> events = await EventApi.getPersonalEvents();
List<EventK> currentDayEvents = [];
DateTime currentDay;
for(int i = 0; i<events.length-1; i++){
currentDay = events[i].startTime;
currentDayEvents.add(events[i]);
for(int j=i+1; j<events.length; j++){
DateTime analyzedDay = events[j].startTime;
if(currentDay.year == analyzedDay.year &&
currentDay.month == analyzedDay.month &&
currentDay.day == analyzedDay.day
){
currentDayEvents.add(events[j]);
events.removeAt(j);
j -= 1;
}
}
_events.putIfAbsent(currentDay, ()=>currentDayEvents);
currentDayEvents.clear();
}
setState(() {
isLoading = false;
});
}

Answer 1

Move the declaration of currentDayEvents inside the for-loop to reinitialise a new object on each iteration. In doing so, you can remove currentDayEvents.clear().
for(int i = 0; i<events.length-1; i++){
currentDay = events[i].startTime;
var currentDayEvents = [events[i]];
for(int j=i+1; j<events.length; j++){
DateTime analyzedDay = events[j].startTime;
if(currentDay.year == analyzedDay.year &&
currentDay.month == analyzedDay.month &&
currentDay.day == analyzedDay.day
){
currentDayEvents.add(events[j]);
events.removeAt(j);
j -= 1;
}
}
_events.putIfAbsent(currentDay, ()=>currentDayEvents);
}