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}
}