length property

@override int length

Return the length of Array

Examples

var a1 = Array([1.0, 2.0, 3.0]);

print(a1.length);

/* output:
3
*/

Implementation

@override
int get length => l.length;

@override void length=(int newLength)

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

@override
set length(int newLength) {
  if (newLength < 0) {
    throw FormatException(
        'newLength must be greater equal than 0 (newLength >= 0)');
  }

  if (newLength == 0) {
    l.clear();
  } else if (newLength > l.length) {
    for (var i = l.length; i < newLength; i++) {
      l.add(0.0);
    }
  } else if (newLength < length) {
    l.removeRange(newLength, l.length);
  }
}