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Line 1,172: </syntaxhighlight> Note that in order to use <code>Map</code>, you have to provide the functor <code>Map.Make</code> with a module which defines the key type and the comparison function. The third-party library ExtLib provides a polymorphic version of functional maps, called <code>PMap</code>,<ref>{{cite web \|title=Module PMap \|url=http://ocaml-extlib.googlecode.com/svn/doc/apiref/PMap.html \|date=2008 \|archive-url=https://web.archive.org/web/20081211233540/http://ocaml-extlib.googlecode.com/svn/doc/apiref/PMap.html \|archive-date=11 December 2008 \|website=Ocaml-extlib \|access-date=3 August 2020}}</ref> which is given a comparison function upon creation. Lists of pairs and functional maps both provide a purely functional interface. By contrast, hash tables provide an imperative interface. For many operations, hash tables are significantly faster than lists of pairs and functional maps.

Comparison of programming languages (associative array): Difference between revisions