// Using Ammonite-REPL @ import $ivy.`net.petitviolet::generic-diff:<VERSION>` @ import net.petitviolet.generic.diff._ ... @ case class User(id: Long, name: String) defined class User @ User(1L, "alice") diff User(1L, "bob") res2: DiffResult[User] = DiffResult(List(FieldSame("id", 1L), FieldDiff("name", "alice", "bob")))

libraryDependencies += "net.petitviolet" %% "generic-diff" % "<version>"

import net.petitviolet.generic.diff._ case class User(id: Long, name: String, age: Int) case class GroupName(value: String) case class Group(id: Long, name: GroupName) def main(args: Array[String]): Unit = { // extract difference between 2 objects val userDiff = User(1L, "alice", 20) diff User(2L, "alice", 35) // result contains sequence of FieldDiff and FieldSame assert(userDiff.fields == List(FieldDiff("id", 1, 2), FieldSame("name", "alice"), FieldDiff("age", 20, 35))) // dynamic field access assert(userDiff.name == FieldSame("name", "alice")) assert(userDiff.age == FieldDiff("age", 20, 35)) // userDiff.foo // compile error! // extract diff from nested objects val groupDiff = Group(1, GroupName("tech")) diff Group(2L, GroupName("hoge")) assert( groupDiff.fields == List( FieldDiff("id", 1, 2), FieldDiff("name", GroupName("tech"), GroupName("hoge")) ) ) }