How do stream transformation methods, such as map, where, and distinct, let you process and filter the values emitted by a Stream, similar to how these same methods work on a regular Dart collection?

Streams support many of the exact same familiar higher order transformation methods available on regular Dart collections, including map to transform each individual emitted value, where to filter out values that do not satisfy a specific given condition, and distinct to automatically skip over any consecutive duplicate values, and chaining these transformation methods together lets you build a clean, readable processing pipeline that only actually emits the exact specific values your particular listener genuinely cares about receiving.

searchController.stream
  .where((query) => query.length > 2)
  .distinct()
  .listen((query) => performSearch(query));