Using calculist to MapReduce Json documents

CalcuList (Calculator with List manipulation), is an educational language for teaching functional programming extended with some imperative and side-effect features, which are enabled under explicit request by the programmer. As the language natively supports json objects, it may be effectively used to implement generic MapReduce, which is a popular model in distributed computing that underpins many NoSQL systems. As a list a jsons can be thought of as a dataset of a document NoSQL datastore, it turns out that CalcuList can be used as a tool for teaching advanced query algorithms for document datastores such as MongoDB and CouchDB.