1. Dart
2. dart:html
3. PaymentInstruments
4. has method

PaymentInstruments class

1. Properties
2. hashCode
3. runtimeType
4. Methods
5. clear
6. delete
7. get
8. has
9. keys
10. noSuchMethod
11. set
12. toString
13. Operators
14. operator ==

Future has(String instrumentKey) =>
    promiseToFuture(JS("", "#.has(#)", this, instrumentKey));