![]() ![]() For more advanced functionalities, we can use Bloc library which puts more effort on using the resources in an efficient manner and offer a simple interface to build the reactive UI. So, in such cases, rather than using Streams, you can use something more that consumes lesser memory such as ChangeNotifier for reactive UI. Not just that, if you forget to close the streams, you will lead to memory leaks. Using Streams with inferior implementation can lead to more memory and CPU usage. While Streams are pretty powerful, if we are using them, it lands a big responsibility on our shoulders in order to make effective use of this resource. To prevent an exception being thrown, one can use ` is`. Generally, the as cast operator throws an exception if the cast is not possible. A void using “as” operator instead of that, use “is” operator.(null aware) operators instead of null checks in conditional expressions. Use Null safe (?) and Null aware (?.) operatorsĪlways go for ? (if null) and ?.You can use spread collections when existing items are already stored in another collection, spread collection syntax leads to simpler and easier code. If we are supposed to perform a sequence of operations on the same object then we should opt for Cascades(.) operator. Smart use of operators to reduce the number of lines for execution The size of the widget must be within the constraints set by its parent. The widget cannot have any size on its own. But this has some limitations attached.įor instance, if you have got a child widget inside a parent widget and you would want to decide on its size. ![]() In Flutter, all widgets give themselves on the basis of their parent or their box constraints. And then, the widget notifies its parent about its own size (within the original constraints, of course). Next, the widget positions its children (horizontally in the x axis, and vertically in the y axis) one after the other. One after another, the widget commands its children what their constraints are (which can be different for each child), and then asks each child what size it wants to be. Next up, the widget goes through its own list of children. A constraint is known to be a set of four doubles: a minimum and maximum width, and a minimum and maximum height. Let’s understand more about the same:Ī widget has its own constraints from its parent. There is a thumb rule of a Flutter layout that every Flutter app developer needs to know: constraints go down, sizes go up, and the parent sets the position. Understanding the concept of constraints in Flutter Should be like this: class Example extends StatefulWidget createState() => _ExampleState()
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