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

var usdKey = curr.keys.firstWhere(
    (k) => curr[k] == 'USD', orElse: () => null);