BuiltMap<K, V> constructor

BuiltMap<K, V>([
  1. dynamic map = const {}
])

Instantiates with elements from a Map or BuiltMap.

Implementation

factory BuiltMap([map = const {}]) {
  if (map is _BuiltMap && map.hasExactKeyAndValueTypes(K, V)) {
    return map as BuiltMap<K, V>;
  } else if (map is Map || map is BuiltMap) {
    return _BuiltMap<K, V>.copyAndCheckTypes(map.keys, (k) => map[k]);
  } else {
    throw ArgumentError('expected Map or BuiltMap, got ${map.runtimeType}');
  }
}