Associates the key
with the given value
.
If the key was already in the map, its associated value is changed. Otherwise the key-value pair is added to the map.
@reflectable void operator []=(K key, V value) {
if (!hasObservers) {
_map[key] = value;
return;
}
int len = _map.length;
V oldValue = _map[key];
_map[key] = value;
if (len != _map.length) {
notifyPropertyChange(#length, len, _map.length);
notifyChange(new MapChangeRecord.insert(key, value));
_notifyKeysValuesChanged();
} else if (oldValue != value) {
notifyChange(new MapChangeRecord(key, oldValue, value));
_notifyValuesChanged();
}
}