key-and-value-mapping-in-dart.dart

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import 'dart:developer' as devtools show log;

extension Log on Object {
  void log() => devtools.log(toString());
}

const names = {'foo': 22, 'bar': 30, 'baz': 40};

extension DetailedMap<K, V> on Map<K, V> {
  Map<R, V> mappedKeys<R>(R Function(K) f) =>
      map((key, value) => MapEntry(f(key), value));

  Map<K, R> mappedValues<R>(R Function(V) f) =>
      map((key, value) => MapEntry(key, f(value)));
}

void testIt() {
  // {foofoo: 22, barbar: 30, bazbaz: 40}
  names.mappedKeys((k) => k * 2).log();
  // {foo: 44, bar: 60, baz: 80}
  names.mappedValues((v) => v * 2).log();
}