void operator []=(K key, V value) { if (key == null) throw new ArgumentError(key); // Splay on the key to move the last node on the search path for // the key to the root of the tree. int comp = _splay(key); if (comp == 0) { _root.value = value; return; } _addNewRoot(new _SplayTreeMapNode(key, value), comp); }
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https://api.dartlang.org/stable/2.0.0/dart-collection/SplayTreeMap/operator_put.html