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Optics libraries

Nicolas Rinaudo • @NicolasRinaudo • Besedo

1 / 22

Libraries

2 / 22

Scalaz

import scalaz.Lens.lensu
val classifierLens = lensu[MlService, Classifier](
  (s, a) => s.copy(classifier = a),
  s      => s.classifier
)
val nameLens = lensu[Classifier, String](
  (s, a) => s.copy(name = a),
  s      => s.name
)
val classifierName = classifierLens andThen nameLens
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Scalaz

import scalaz.Lens.lensu
val classifierLens = lensu[MlService, Classifier](
  (s, a) => s.copy(classifier = a),
  s      => s.classifier
)
val nameLens = lensu[Classifier, String](
  (s, a) => s.copy(name = a),
  s      => s.name
)
val classifierName = classifierLens andThen nameLens
4 / 22

Scalaz

import scalaz.Lens.lensu
val classifierLens = lensu[MlService, Classifier](
  (s, a) => s.copy(classifier = a),
  s      => s.classifier
)
val nameLens = lensu[Classifier, String](
  (s, a) => s.copy(name = a),
  s      => s.name
)
val classifierName = classifierLens andThen nameLens
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Scalaz

import scalaz.Lens.lensu
val classifierLens = lensu[MlService, Classifier](
  (s, a) => s.copy(classifier = a),
  s      => s.classifier
)
val nameLens = lensu[Classifier, String](
  (s, a) => s.copy(name = a),
  s      => s.name
)
val classifierName = classifierLens andThen nameLens
6 / 22

Scalaz

import scalaz.Lens.lensu
val classifierLens = lensu[MlService, Classifier](
  (s, a) => s.copy(classifier = a),
  s      => s.classifier
)
val nameLens = lensu[Classifier, String](
  (s, a) => s.copy(name = a),
  s      => s.name
)
val classifierName = classifierLens andThen nameLens
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Scalaz

classifierName.mod(_.toUpperCase, service)
// res0: MlService = MlService(Login(jsmith,Tr0ub4dor&3),Classifier(NEWS20,20))
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Shapeless

import shapeless.lens
val classifierName = lens[MlService].classifier.name
val userName = lens[MlService].auth.user
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Shapeless

import shapeless.lens
val classifierName = lens[MlService].classifier.name
val userName = lens[MlService].auth.user
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Shapeless

classifierName.modify(service)(_.toUpperCase)
// res1: MlService = MlService(Login(jsmith,Tr0ub4dor&3),Classifier(NEWS20,20))
userName.set(service)("psmith")
// res2: MlService = MlService(Login(psmith,Tr0ub4dor&3),Classifier(news20,20))
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Quicklens

import com.softwaremill.quicklens._
val classifierName = modify[MlService](_.classifier.name)
val userName = modify[MlService](_.auth.when[Login].user)
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Quicklens

import com.softwaremill.quicklens._
val classifierName = modify[MlService](_.classifier.name)
val userName = modify[MlService](_.auth.when[Login].user)
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Quicklens

import com.softwaremill.quicklens._
val classifierName = modify[MlService](_.classifier.name)
val userName = modify[MlService](_.auth.when[Login].user)
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Quicklens

import com.softwaremill.quicklens._
val classifierName = modify[MlService](_.classifier.name)
val userName = modify[MlService](_.auth.when[Login].user)
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Quicklens

classifierName.using(_.toUpperCase)(service)
// res3: MlService = MlService(Login(jsmith,Tr0ub4dor&3),Classifier(NEWS20,20))
userName.setTo("psmith")(service)
// res4: MlService = MlService(Login(psmith,Tr0ub4dor&3),Classifier(news20,20))
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Monocle

import monocle.macros._
val classifierName = GenLens[MlService](_.classifier.name)
val userName = GenLens[MlService](_.auth).
  composePrism(GenPrism[Auth, Login]).
  composeLens(GenLens[Login](_.user))
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Monocle

import monocle.macros._
val classifierName = GenLens[MlService](_.classifier.name)
val userName = GenLens[MlService](_.auth).
  composePrism(GenPrism[Auth, Login]).
  composeLens(GenLens[Login](_.user))
18 / 22

Monocle

import monocle.macros._
val classifierName = GenLens[MlService](_.classifier.name)
val userName = GenLens[MlService](_.auth).
  composePrism(GenPrism[Auth, Login]).
  composeLens(GenLens[Login](_.user))
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Monocle

import monocle.macros._
val classifierName = GenLens[MlService](_.classifier.name)
val userName = GenLens[MlService](_.auth).
  composePrism(GenPrism[Auth, Login]).
  composeLens(GenLens[Login](_.user))
20 / 22

Monocle

classifierName.modify(_.toUpperCase)(service)
// res5: MlService = MlService(Login(jsmith,Tr0ub4dor&3),Classifier(NEWS20,20))
userName.set("psmith")(service)
// res6: MlService = MlService(Login(psmith,Tr0ub4dor&3),Classifier(news20,20))
21 / 22

Questions?

Nicolas Rinaudo • @NicolasRinaudo • Besedo

22 / 22

Libraries

2 / 22
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