operator [] method

String operator [](int index)

Returns the object at the given index in the list or throws a RangeError if index is out of bounds.

Source

String operator [](int index) {
  if (index < 0 || index >= length) throw new RangeError.index(index, this);
  return _nativeIndexedGetter(index);
}

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https://api.dartlang.org/stable/1.24.3/dart-html/DomStringList/operator_get.html