operator []= method

void operator []=(int index, Node value)

Sets the value at the given index in the list to value or throws a RangeError if index is out of bounds.

Source

void operator []=(int index, Node value) {
  throw new UnsupportedError("Cannot assign element of immutable List.");
}

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https://api.dartlang.org/stable/1.24.3/dart-html/HtmlCollection/operator_put.html