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containsKey method

bool containsKey (Object key)

Returns true if this map contains the given key.

Returns true if any of the keys in the map are equal to key according to the equality used by the map.

Implementation

bool containsKey(Object key) => keys.contains(key);

© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/2.0.0/dart-collection/MapMixin/containsKey.html