How can i add an entry to a specific index in a list?

You can use insertRange, it will grow the list when adding new elements.

var list = ["1","3","4"];
list.insertRange(0, 1, "0");
list.insertRange(2, 1, "2");
list.forEach((e) => print(e));

You can try it out on the DartBoard here

You can use the insert() and removeAt() methods now.

Dart 2

var idx = 3;
list.insert(idx, 'foo');

Depends on whether you want to insert a single item or a bunch of items

All available methods https://api.dartlang.org/stable/2.1.0/dart-core/List-class.html#instance-methods

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