LinkedHashMap<K, V>.from 构造函数

LinkedHashMap<K, V>.from(
  1. Map other
)

创建一个包含 other 中所有键值对的 LinkedHashMap。

键必须是 K 的实例，值必须是 V。other 映射可以是任何类型。示例

final baseMap = <num, Object>{1: 'A', 2: 'B', 3: 'C'};
final fromBaseMap = LinkedHashMap<int, String>.from(baseMap);
print(fromBaseMap); // {1: A, 2: B, 3: C}

实现

factory LinkedHashMap.from(Map<dynamic, dynamic> other) {
  LinkedHashMap<K, V> result = LinkedHashMap<K, V>();
  other.forEach((dynamic k, dynamic v) {
    result[k as K] = v as V;
  });
  return result;
}