WRITE "Phone Number :",^phonebook("Sally Smart"),! MERGE ^phonebook=phonebook copying temporary data into permanent dataĪccessing the value of an element simply requires using the name with the subscript: Random Hacker")="553-1337" storing temporary data SET phonebook("John Doe")="555-1212" storing temporary data SET ^phonebook("Sally Smart")="555-9999" storing permanent data The name for globals is preceded by the circumflex "^" to distinguish them from local variables. The built-in, language-level, direct support for associative arraysĪpplies to private, process-specific arrays stored in memory called "locals" as well as to the permanent, shared, global arrays stored on disk which are available concurrently to multiple jobs. In MUMPS every array is an associative array. While tolerating arbitrary objects, even heterogeneity within a single hash table instance, the specification of this key :test function is confined to distinguishable entities: the Common Lisp standard only mandates the support of eq, eql, equal, and equalp, yet designating additional or custom operations as permissive for concrete implementations. A further characteristic is the fact that Common Lisp hash tables do not, as opposed to association lists, maintain the order of entry insertion.Ĭommon Lisp hash tables are constructed via the make-hash-table function, whose arguments encompass, among other configurations, a predicate to test the entry key. Hash tables have greater overhead than alists, but provide much faster access when there are many elements. Common Lisp also supports a hash table data type, and for Scheme they are implemented in SRFI 69. value ) entry ( cons ( reverse key ) ( reverse value )))) phone-book )īecause of their linear nature, alists are used for relatively small sets of data. ( map-into phone-book #' ( lambda ( entry ) ( destructuring-bind ( key. ( map 'vector #' cdr phone-book ) Destructively modify the "phone-book" via "map-into". Return a vector of the "phone-book" values.
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