1. Dart
2. dart:html
3. MidiOutputMap
4. length property

##### MidiOutputMap class

1. Properties
2. entries
3. hashCode
4. isEmpty
5. isNotEmpty
6. keys
7. length
8. runtimeType
9. values
10. Methods
11. addAll
12. addEntries
13. cast
14. clear
15. containsKey
16. containsValue
17. forEach
18. map
19. noSuchMethod
20. putIfAbsent
21. remove
22. removeWhere
23. toString
24. update
25. updateAll
26. Operators
27. operator ==
28. operator []
29. operator []=

description

# length property Null safety

int length
override

The number of key/value pairs in the map.

## Implementation

    int get length => JS('int', '#.size', this);