description

# length property Null safety

int length
override

Returns the number of elements in this.

Counting all elements may involve iterating through all elements and can therefore be slow. Some iterables have a more efficient way to find the number of elements.

## Implementation

    int get length {
      assert(this is! EfficientLengthIterable);
      int count = 0;
      Iterator it = iterator;
      while (it.moveNext()) {
        count++;
      }
      return count;
    }