state_beacon 0.3.3

A reactive primitive for dart and flutter

Overview

A Beacon is a reactive primitive. This means that it provides facilities for executing any code when a it's value is modified.

Features

• WritableBeacon: Read and write values reactively.
• ReadableBeacon: Read-only reactive values.
• LazyBeacon: Lazy initialization of reactive values.
• DebouncedBeacon: Debounce value changes over a specified duration.
• ThrottledBeacon: Throttle value changes based on a duration.
• FilteredBeacon: Update values based on filter criteria.
• TimestampBeacon: Attach timestamps to each value update.
• StreamBeacon: Create beacons from Dart streams.
• FutureBeacon: Initialize beacons from futures.
• DerivedBeacon: Compute values reactively based on other beacons.
• DerivedFutureBeacon: Asynchronously compute values with state tracking.
• ListBeacon: Manage lists reactively.
• createEffect: React to changes in beacon values.
• doBatchUpdate: Batch multiple updates into a single notification.

Usage

final name = Beacon.writable("Bob");
final age = Beacon.writable(20);
final college = Beacon.writable("MIT");

Beacon.createEffect(() {
  var msg = '${name.value} is ${age.value} years old';

  if (age.value > 21) {
      msg += ' and can go to ${college.value}';
  }
  print(msg);
});

name.value = "Alice"; // prints "Alice is 20 years old"
age.value = 21; // prints "Alice is 21 years old"
college.value = "Stanford"; // prints "Alice is 21 years old"
age.value = 22; // prints "Alice is 22 years old and can go to Stanford"
college.value = "Harvard"; // prints "Alice is 22 years old and can go to Harvard"