Could you identify any potential issues or best practices that are not followed in this Flutter code snippet, particularly regarding the lifecycle methods and the management of a custom listener object?

#interview #question

#interview #question

Blocs and streams (emit.forEach)

Occasionally, we utilize blocs that observe a continuous flow of data. Typically, this flow originates from a repository within our domain layer, where it can be observed by several blocs. These blocs then leverage the data stream to inform their operational decisions based on business logic.

When dealing with streams in Bloc versions 7.2.0 and above, we can leverage the functionalities offered by the emit object to streamline our interaction with streams. The emit.forEach method enables us to receive a callback whenever there is data in the stream. Moreover, when our event handler is terminated or completes its task, it automatically handles the cleanup process by ending the stream subscription.

Here's an example illustrating how much emit.forEach method saves us from writing repetitive boilerplate code when utilizing stream in bloc.

#info #tip

Will the variables m1 and m2 refer to the same memory location?

output:

228
228
true

#interview #question

Why does Dart Type Promotion work with variables but not Object properties?

In Dart, type promotion works with variables because the compiler can guarantee that the type check condition holds for the duration of the variable's scope. However, for object properties, the compiler cannot ensure that the property value remains unchanged by other code after the type check. This inability to guarantee immutability or consistent state prevents type promotion for object properties.

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