How can i sort a Vector of objects in Scala?

Method sorted of Vector takes an implicit parameter of type math.Ordering[B], which it uses for sorting. There are several ways to provide it:

1. Define an implicit math.Ordering[MyClass]. You can create an Ordering for your class using the methods from the Ordering companion object:

   case class MyClass(field: Int)
   object MyClass {
     implicit val MyClassOrdering: Ordering[MyClass] = Ordering.by(_.field)
   }
   

   If the Ordering is defined in the companion object of MyClass, it'll be provided for sorting automatically. Otherwise, you'll have to import it manually before calling sorted. Ordering allows to provide several different ordering defined on a class, and to import or provide explicitly the one you want.

2. Have your class extend Ordered[MyClass] by overriding compare method. In this case the necessary Ordering will be created implicitly.

   case class MyClass(field: Int) extends Ordered[MyClass] {
     def compare(other: MyClass): Int = this.field compareTo other.field
   }
   

   This will also add methods <, >, <=, >= to the class.

3. Use sortBy or sortWith methods of Vector, which take a function and don't need an Ordering parameter.

   vectorOfMyClass.sortBy(_.field)
   vectorOfMyClass.sortWith(_.field < _.field)