Removes the objects in the range start inclusive to end exclusive.
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.
Throws an UnsupportedError if this is a fixed-length list. In that case the list is not modified.
void removeRange(int start, int end);
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.5.0/dart-core/List/removeRange.html