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/Dart 2

putIfAbsent method

V putIfAbsent (K key, V ifAbsent())
inherited

This operation is not supported by an unmodifiable map.

Implementation

V putIfAbsent(K key, V ifAbsent()) {
  throw UnsupportedError("Cannot modify unmodifiable map");
}

© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.5.0/dart-collection/UnmodifiableMapView/putIfAbsent.html