operator [] method

@override V operator [](Object? key)

Get corresponded values, which associated with key.

Unlike Map will return Null when no value paired with key, it throws InvalidDictionaryKeyError.

In additions, the key must be String type, applying other types will throw DictionaryKeyTypeMismatchError.

Implementation

@override
V operator [](Object? key) {
  _checkKeyType(key);

  if (!containsKey(key)) {
    throw InvalidDictionaryKeyError(key as String,
        "No value found that it associated with the given key.");
  }

  return entries.singleWhere((element) => element.key == key).value;
}