length property
The number of boolean values in this list.
The valid indices for a list are 0 through length - 1.
If the list is growable, setting the length will change the
number of values.
Setting the length to a smaller number will remove all
values with indices greater than or equal to the new length.
Setting the length to a larger number will increase the number of
values, and all the new values will be false.
Implementation
@override
int get length => _length;Setting the length changes the number of elements in the 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.
final maybeNumbers = <int?>[1, null, 3];
maybeNumbers.length = 5;
print(maybeNumbers); // [1, null, 3, null, null]
maybeNumbers.length = 2;
print(maybeNumbers); // [1, null]
final numbers = <int>[1, 2, 3];
numbers.length = 1;
print(numbers); // [1]
numbers.length = 5; // Throws, cannot add `null`s.
Implementation
set length(int newLength);