Classes (1)

Classes can be defined in Bobbee:

class XmlCommentItem : XmlInstanceItem {
  val data : String;
  def this (this.data);
  def toString () : String :> "<!--%s-->" (data);
}

• XmlCommentItem inherits from XmlInstanceItem.

• ‶data″ is invariant (a value) once a class instance is created.

• def this creates an instance, assigning the value passed to it to the ‶data″ field.

• ‶toString″ wraps ‶data″ in comment start and end marks.