HashMap.from factory constructor
HashMap.from(Creates a HashMap that contains all key/value pairs of other
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Source
factory HashMap.from(Map other) { HashMap<K, V> result = new HashMap<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/HashMap/HashMap.from.html