removeWhere method
Removes all entries of this map that satisfy the given predicate
.
Implementation
M<K, V> removeWhere(bool Function(K key, V value) predicate) {
Map<K, V> oldMap = unlock;
int oldLength = oldMap.length;
Map<K, V> newMap = oldMap..removeWhere(predicate);
return (newMap.length == oldLength) ? this : MFlat<K, V>.unsafe(newMap);
}