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// first test
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import CW7b._
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def urban_groupById(ratings: List[(String, String)]) =
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ratings.groupBy(_._1).view.mapValues(_.map(_._2)).toMap
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def urban_get_csv_file(name: String) : List[String] = {
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import io.Source
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import scala.util._
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val csv = Source.fromFile(name)
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csv.mkString.split("\n").toList.drop(1)
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}
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def urban_process_ratings(lines: List[String]) : List[(String, String)] = {
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for (cols <- lines.map(_.split(",").toList);
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if (cols(2).toFloat >= 4)) yield (cols(0), cols(1))
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}
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val urban_good_ratings = process_ratings(urban_get_csv_file("ratings.csv"))
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val urban_ratings_map = urban_groupById(urban_good_ratings)
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assert(favourites(urban_ratings_map, "912").length == 80)
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assert(favourites(urban_ratings_map, "858").length == 158)
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assert(favourites(urban_ratings_map, "260").length == 201)
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