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List.from factory constructor
List.from(Creates a list containing all elements.
The Iterator of elements provides the order of the elements.
This constructor returns a growable list when growable is true; otherwise, it returns a fixed-length list.
Source
external factory List.from(Iterable elements, {bool growable: true});
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 https://api.dartlang.org/stable/1.24.3/dart-core/List/List.from.html