List use of double dot (.) in dart?

Question

Sometimes I see this List list = [];

Then list..add(color)

What's the difference between using 1 dot(.) and 2 dot(..)?

Answer 1

.. is known as cascade notation. It allows you to not repeat the same target if you want to call several methods on the same object.

List list = [];
list.add(color1);
list.add(color2);
list.add(color3);
list.add(color4);

// with cascade

List list = [];
list
  ..add(color1)
  ..add(color2)
  ..add(color3)
  ..add(color4);