SplayTreeMap.from(Map other, [ int compare(K key1, K key2), bool isValidKey(potentialKey) ])

Creates a SplayTreeMap that contains all key/value pairs of other.

Source 

factory SplayTreeMap.from(Map other,
    [int compare(K key1, K key2), bool isValidKey(potentialKey)]) {
  SplayTreeMap<K, V> result = new SplayTreeMap<K, V>(compare, isValidKey);
  other.forEach((k, v) {
    result[k as Object/*=K*/] = v as Object/*=V*/;
  });
  return result;
}