Overriding methods and fields
In Scala, fields and methods belong to the same namespace. This makes it possible for a field to override a parameterless method. For instance, you could change the implementation of contents in class ArrayElement from a method to a field without having to modify the abstract method definition of contents in class Elementabstract class Element {
def contents: Array[String]
}
class ArrayElement(conts: Array[String]) extends Element {
val contents: Array[String] = conts
}
Source: Overriding methods and fields
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