Kotlin Academy · Lesson

copy and equals

Generated functions.

Generated Functions

Beyond toString, a data class generates equals, hashCode, and copy.

These three make data classes a joy to compare and clone.

The generated equals compares objects by their property values, not their identity.

Two data class instances with the same values are equal with ==.

data class User(val name: String, val age: Int)

fun main() {
    val a = User("Alice", 30)
    val b = User("Alice", 30)
    println(a == b)
}