Scala Notes: Set

In Scala, an instance of Set can be declared as follows.

    val s = (1 to 6).toSet 

Principle difference between sets and sequences are three:

  • Sets are unordered
    val s = (1 to 6).toSet                          
    //> s  : scala.collection.immutable.Set[Int] = Set(5, 1, 6, 2, 3, 4)
  • Sets do not have duplicate elements
    s map (_ % 2 ==0) 
    //> res8: scala.collection.immutable.Set[Boolean] = Set(false, true)
  • The fundamental operation on set is contains.
    s contains 5
    //> res9: Boolean = true
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