length property Null safety
The number of objects in this list.
The valid indices for a list are 0 through length - 1.
Implementation
int get length;Changes the length of this list.
The list must be growable.
If newLength is greater than current length,
new entries are initialized to null,
so newLength must not be greater than the current length
if the element type E is non-nullable.
Implementation
set length(int newLength);