Create canonicalized-maps-in-dart.dart

tipsandtricks/canonicalized-maps-in-dart/canonicalized-maps-in-dart.dart

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+
+import 'package:collection/collection.dart'; // flutter pub add collection
+import 'dart:developer' as devtools show log;
+
+const personsAndAges = {
+  'Andy': 42,
+  'John': 30,
+  'jane': 25, // lower-cased intentionally
+  'Bob': 30,
+  'Jenny': 25,
+};
+
+void testIt() {
+  final canonicalized = CanonicalizedMap.from(
+    personsAndAges,
+    (key) => key.characters.first.toLowerCase(),
+  );
+
+  canonicalized.log(); // prints {Andy: 42, Jenny: 25, Bob: 30}
+}