prepare 2.2.0-nullsafety.2

Author: hoc081098

CHANGELOG.md

@@ -1,3 +1,14 @@
+## 2.2.0-nullsafety.2 - Feb 9, 2021
+-   Add `Selector`s: `select`, `select2`, ..., `select9` and `selectMany`.
+    -   Selectors can compute derived data, allowing Redux to store the minimal possible state.
+    -   Selectors are efficient. A selector is not recomputed unless one of its arguments changes.
+    -   When using the [select], [select2] to [select9], [selectMany] functions, 
+        keeps track of the latest arguments in which your selector function was invoked. 
+        Because selectors are pure functions, the last result can be returned 
+        when the arguments match without reinvoking your selector function. 
+        This can provide performance benefits, particularly with selectors that perform expensive computation. 
+        This practice is known as memoization.
+
 ## 2.2.0-nullsafety.1 - Nov 30, 2020
 -   Fixed: support nullable action.
 

pubspec.yaml

@@ -1,6 +1,6 @@
 name: rx_redux
 description: Redux implementation based on Dart Stream, with the power of RxDart. Reactive redux store for Dart & Flutter.
-version: 2.2.0-nullsafety.1
+version: 2.2.0-nullsafety.2
 author: Petrus Nguyen Thai Hoc <[email protected]>
 homepage: https://github.com/hoc081098/rx_redux.git
 repository: https://github.com/hoc081098/rx_redux.git

test/utils.dart

@@ -1,4 +1,20 @@
-import 'package:quiver/core.dart';
+/// Generates a hash code for multiple [objects].
+int hashObjects(Iterable<int> objects) =>
+    _finish(objects.fold(0, (h, i) => _combine(h, i.hashCode)));
+
+// Jenkins hash functions
+
+int _combine(int hash, int value) {
+  hash = 0x1fffffff & (hash + value);
+  hash = 0x1fffffff & (hash + ((0x0007ffff & hash) << 10));
+  return hash ^ (hash >> 6);
+}
+
+int _finish(int hash) {
+  hash = 0x1fffffff & (hash + ((0x03ffffff & hash) << 3));
+  hash = hash ^ (hash >> 11);
+  return 0x1fffffff & (hash + ((0x00003fff & hash) << 15));
+}
 
 /// Represents a 8-tuple.
 class Tuple8<T1, T2, T3, T4, T5, T6, T7, T8> {