Flutter Questions

Mixins are a way to create a class that inherits from another class and adds some functionality to it.

Null-aware operators are operators that allow you to use the null-safe operator syntax. For example, you can use ?.  to access the property of a nullable object.

A source of asynchronous data events.

A Stream provides a way to receive a sequence of events. Each event is either a data event, also called an element of the stream, or an error event, which is a notification that something has failed.

When a stream has emitted all its events, a single "done" event notifies the listener that the end has been reached.

There are two kinds of streams: "Single-subscription" streams and "broadcast" streams.

A single-subscription stream allows only a single listener during the whole lifetime of the stream.

It doesn't start generating events until it has a listener, and it stops sending events when the listener is unsubscribed, even if the source of events could still provide more.

The stream created by an async* function is a single-subscription stream, but each call to the function creates a new such stream.

A broadcast stream allows any number of listeners, and it fires its events when they are ready, whether there are listeners or not.

Broadcast streams are used for independent events/observers.

Ticker is a "special" periodic timer that we can use to be notified when the Flutter engine is about to draw a new frame.