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+<H3>Javascript arrays</H3>
+Note that javascript arrays have some very powerful member functions. 
+For a description see for example 
+<A HREF="http://www.tutorialspoint.com/javascript/javascript_arrays_object.htm">here</A>
+or search google for function like <i>map</i> or <i>reduce</i>.
+
 <H3>The global object $</H3>