case class Person(address: Address)
case class Address(street: Street)
case class Street(name: String)
val person = Person(Address(Street("1 Functional Rd.")))
import com.github.pathikrit.sauron._
lens(person)(_.address.street.name)(_.toUpperCase)

person.copy(address = person.address.copy(
  street = person.address.street.copy(
    name = (person.address.street.name).toUpperCase)
  )
)

lens(person)(_.address.street.name).setTo("1 Objective Rd.")

val f1 = lens(person)(_.address.street.name)
val p1: Person = f1(_.toLowerCase)
val p2: Person = f1(_.toUpperCase)

val f = lens(_: Person)(_.address.street.name)
val p3: Person = f(p1)(_.toUpperCase)
val p4: Person = f(p2)(_.toLowerCase)

val lens1: Person ~~> Address = lens(_: Person)(_.address)
val lens2: Address ~~> String = lens(_: Address)(_.street.name)
val lens3: Person ~~> String = lens1 andThenLens lens2 // or lens2 composeLens lens1
val p5: Person = lens3(person)(_.toLowerCase)

resolvers += Resolver.bintrayRepo("pathikrit", "maven")
libraryDependencies += "com.github.pathikrit" %% "sauron" % "1.1.0"
addCompilerPlugin("org.scalamacros" % "paradise" % "2.1.0-M5" cross CrossVersion.full)