Конструктор-фабрика LinkedHashMap.from
LinkedHashMap.from(Создаёт LinkedHashMap, содержащий все пары ключ-значение из other.
Исходный код
factory LinkedHashMap.from(Map other) {
LinkedHashMap<K, V> result = new LinkedHashMap<K, V>();
other.forEach((k, v) {
result[k as Object/*=K*/] = v as Object/*=V*/;
});
return result;
}
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https://api.dartlang.org/stable/1.24.3/dart-collection/LinkedHashMap/LinkedHashMap.from.html