Data classes are classes specifically designed to hold data. The compiler automatically generates equals(), hashCode(), toString(), copy(), and destructuring declarations.
data class Person(val name: String, val age: Int)
val person1 = Person("Alice", 30)
val person2 = person1.copy(age = 31) // Copy with modification
val (name, age) = person1 // Destructuring
println(person1) // Automatically generated toString()
Requirements for data classes:
Primary constructor must have at least one parameter
All parameters must be marked as val or var
Cannot be abstract, open, sealed, or inner
Rewriting in plainer words…
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