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232 \subsection*{Tasks} |
232 \subsection*{Tasks} |
233 |
233 |
234 \begin{itemize} |
234 \begin{itemize} |
235 \item[(3)] Implement a kind of grouping function that calculates a Map |
235 \item[(3)] Implement a kind of grouping function that calculates a Map |
236 containing the userIDs and all the corresponding recommendations for |
236 containing the userIDs and all the corresponding recommendations for |
237 this user (list of movieIDs). This should be implemented in a tail |
237 this user (list of movieIDs). This should be implemented in a |
238 recursive fashion using a Map as accumulator. This Map is set to |
238 tail-recursive fashion using a Map as accumulator. This Map is set to |
239 \pcode{Map()} at the beginning of the calculation. For example |
239 \pcode{Map()} at the beginning of the calculation. For example |
240 |
240 |
241 \begin{lstlisting}[numbers=none] |
241 \begin{lstlisting}[numbers=none] |
242 val lst = List(("1", "a"), ("1", "b"), |
242 val lst = List(("1", "a"), ("1", "b"), |
243 ("2", "x"), ("3", "a"), |
243 ("2", "x"), ("3", "a"), |