Flutter widgets from scratch

we could simply set its color property to blue, … and because our widgets are immutable, … the old one gets destroyed … and the new one gets created with the updated properties. … Now, we can also change its style … and that way Flutter can keep our components performant … and keep our apps fast. … So, how do we actually go about composing widgets? … Well, even if we think about … a basic widget such as a container, … it's actually composed of smaller widgets, … such as a LimitedBox with a ConstrainedBox, … with some align, with some Padding, with a DecoratedBox. … So, a whole bunch of widgets that are very basic … and do very simple things … came together to build a container. … And this goes back to that idea of having … very simple, immutable building blocks … that are like small pieces of Lego, … and by combining these simple widgets together … we can build a more complex and more interesting widget. … So, rather than taking a prebuilt large widget, … such as a FloatingActionButton, …