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Conveniences, usually extension methods, that seem useful across projects.

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package com.mchange.conveniences.collection

import scala.collection.*

object NotUnique:
  case object Empty extends NotUnique
  case class Multiple( n : Int ) extends NotUnique
sealed trait NotUnique

extension[T] ( c : Seq[T] | Set[T] )
  def uniqueOr( notUnique : NotUnique => T ) : T =
    c.size match
      case 0 => notUnique( NotUnique.Empty )
      case 1 => c.head
      case n => notUnique( NotUnique.Multiple(n) )