MarkLogic Server 11.0 Product Documentationmap functions
The table below lists all the
map built-in
functions (in this namespace:
http://marklogic.com/xdmp/map).
The map built-in functions are used to create maps. Maps store name-value pairs in an in-memory data structure. You can also persist a map to disk by storing it in a document. Some programming languages implement maps using hash tables, but these map functions make it convenient for you to create and update your own maps.
Maps are represented using the map:map XQuery primitive
type. When you serialize an object of map:map type, it
serializes to an XML node in the http://marklogic.com/xdmp/map
namespace.
12 functions
| Function name | Description |
|---|---|
| map:clear | Clear a map. |
| map:contains | Returns true if the key exists in the map. |
| map:count | Returns the number of keys used in the map. |
| map:delete | Delete a value from a map. |
| map:entry | Constructs a new map with a single entry consisting of the key and value specified as arguments. |
| map:get | Get a value from a map. |
| map:keys | Get the keys used in the map. |
| map:map | Creates a map. |
| map:new | Constructs a new map by combining the keys from the maps given as an argument. |
| map:put | Put a value into a map at the given key. |
| map:set-javascript-by-ref | If true is specified, sets a map:map to be passed to JavaScript by reference. |
| map:with | Updates a map, inserting a value into it at the given key. |