push method
Implementation
void push(String name) {
var state = _stateMap['$name@0'];
if (state != null && state is ReduxStateItem) {
int index = 0;
if (_stackMap[name] != null) {
index = _stackMap[name]!;
state = _stateMap['$name@$index'];
}
index += 1;
_stackMap[name] = index;
_stateMap['$name@$index'] = state.clone();
}
}