Classes that simply hold data should be refactored into a data class. Data classes are specialized to hold data and generate hashCode, equals and toString implementations as well. Read more about data class: https://kotlinlang.org/docs/data-classes.html

Noncompliant Code

class DataClassCandidate(val i: Int) {
    val i2: Int = 0
}

Compliant Code

data class DataClass(val i: Int, val i2: Int)

// classes with delegating interfaces are compliant
interface I
class B() : I
class A(val b: B) : I by b

Options

• allowVars (default: False)

  allows to relax this rule in order to exclude classes that contains one (or more) vars