addAll method
override
Adds all key/value pairs of other
to this map.
If a key of other
is already in this map, its value is overwritten.
The operation is equivalent to doing this[key] = value
for each key and associated value in other. It iterates over other
, which must therefore not change during the iteration.
Implementation
void addAll(Map<String, dynamic> other) { throw new UnsupportedError("Not supported"); }
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https://api.dart.dev/stable/2.13.0/dart-web_audio/AudioParamMap/addAll.html