### 11.8 Associative Maps ¶

Starting with version 11.1, MIT/GNU Scheme provides an abstract associative-map interface that can be backed by any kind of association mechanism. The interface is similar to that of SRFI 125. Associative maps can be mutable or immutable, depending on the backing implementation. As of this writing we support the following implementations: alists, weak alists, red/black trees, hash tables, and tries, all of which are mutable.