CODEWITHSUNDEEP
scalasortingmultiple-columns
ideaboxer
ideaboxer

Reputation: 4101

Sort Array of Maps by more than one value

For instance, how can I sort this Array by points and name using a function like Scala's sortWith:

val arr = Array(
  Map("name"->"A","points"->"10"),
  Map("name"->"B","points"->"9"),
  Map("name"->"C","points"->"8") )

Sort by points only:

arr.sortWith(_.get("points").getOrElse("0").toLong < _.get("points").getOrElse("0").toLong)`

Upvotes: 1

Views: 190

Answers (1)

Doug Ayers
Doug Ayers

Reputation: 1078

You can use the sortBy function:

arr.sortBy( ( m: Map[String, String] ) => ( ( m.getOrElse( "points", "0" ).toLong, m.get( "name" ) ) ) )

This above snippet will sort by points first (smallest to largest), then to break any ties then alphabetically by the name (asc).

The function "comparator" passed in to the sortBy function may return a value that is a tuple (one or more discriminators to sort by). So in this case, I'm returning ( points, name )

Upvotes: 3

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