replaceRange method

@override void replaceRange(int start, int end, Iterable<E> replacement)

Removes the objects in the range start inclusive to end exclusive and inserts the contents of replacement in its place.

    List<int> list = [1, 2, 3, 4, 5];
    list.replaceRange(1, 4, [6, 7]);
    list.join(', '); // '1, 6, 7, 5'

The provided range, given by start and end, must be valid. A range from start to end is valid if 0 <= start <= end <= len, where len is this list's length. The range starts at start and has length end - start. An empty range (with end == start) is valid.

If any of replacements's elements already exist in the list, a DuplicateValueError will be thrown regardless of whether the list is strict or not, unless the resulting list does not contain any duplicate values once all values have been set.

Implementation

@override
void replaceRange(int start, int end, Iterable<E> replacement) {
  // Check if any of the values in [replacement] already exist in the list.
  for (var value in replacement) {
    if (_contains(value)) {
      // If so, check whether the list will contain any duplicate values once
      // every value has been set.
      final result = List<E>.of(elements)
        ..replaceRange(start, end, replacement);

      if (_containsDuplicateValues(result, nullable: nullable)) {
        throw DuplicateValueError(
            _getDuplicateValue(result, nullable: nullable));
      } else {
        break;
      }
    }
  }

  elements.replaceRange(start, end, replacement);
}