How to get Map keys by values in Dart?

Question

In Dart language how to get MAP keys by values?

I have a Map like;

{
  \"01\": \"USD\",
  \"17\": \"GBP\",
  \"33\": \"EUR\"
}

And I n

Answer 1

Map map = {1: 'one', 2: 'two', 3: 'three'};

var key = map.keys.firstWhere((k) => map[k] == 'two', orElse: () => null);
print(key);