fillRange abstract method
void fillRange(Sets the objects in the range start inclusive to end exclusive to the given fillValue.
The provide 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.
Source
void fillRange(int start, int end, [E fillValue]);
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https://api.dartlang.org/stable/1.24.3/dart-core/List/fillRange.html