• Change the organisation from com.github.julien-truffaut to dev.optics

libraryDependencies ++= Seq(
 "dev.optics" %% "monocle-core"  % "3.0.0",
 "dev.optics" %% "monocle-macro" % "3.0.0", // only for Scala 2.13
)

Focus macro

• new macro to generate optics from a path (similar to XPath/JsonPath) @kenbot and @yilinwei

import monocle.Focus

case class User(name: String, address: Address)
case class Address(streetNumber: Int, streetName: String)

Focus[User](_.name)
// res: Lens[User, String]
Focus[User](_.address.streetNumber)
// res: Lens[User, Int]

• pre-apply Focus to an object (#1039) @kenbot

import monocle.syntax.all._

val anna = User("Anna", Address(12, "high street")

anna.focus(_.name).replace("Bob")
anna.focus(_.address.some.streetNumber).modify(_ + 1)

• [Scala 3 only] operators for Focus path. This feature was enabled by a trick found by @yilinwei #1079
  • as (#1050 #1112) @kenbot
  • withDefault (#1094) @kenbot
  • at, index (#1081) @kenbot
  • each (#1072) @kenbot
  • some @kenbot
• [Scala 3 only] field selection on case classes with a single field generates an Iso (#1111) @kenbot

import monocle.Focus

case class UserId(value: Long)

Focus[UserId](_.value)
// res: Iso[UserId, Long]

API updates

• inheritance between optics (#1088 #1116) @julien-truffaut
• add andThen to compose (#967 #1000) @julien-truffaut
• add replace, deprecate set (#974) @sapizhak
• add replaceOption, deprecate setOption (#1006) @jamesbruce97
• add filter, deprecate unsafeSelect (#988) @julien-truffaut
• add type aliases for AppliedOptics (#1113) @julien-truffaut
• use monocle.syntax.all._ for all extension methods including macros (#1120) @julien-truffaut
• add shortcut to all optics for common composition patterns:
  • at and index (#978) @sapizhak
  • filterIndex (#999) @julien-truffaut
  • as (#1110, #1123) @julien-truffaut
  • each (#908) @julien-truffaut
  • withDefault (#886) @julien-truffaut
  • to (#896) @TimWSpence
• add orElse on Optional (#1021) @julien-truffaut
• add cats instances to zip Lenses together (#1109) @vaslabs
• add optics extension method, deprecate all applyX methods (#1003) @julien-truffaut
• generalise Traversal.applyN to accept Optionals (#1100) @julien-truffaut
• add POptional into Ior's left and right (#893) @chwthewke
• move Map instance for Each and FilterIndex from unsafe module to core (#998) @julien-truffaut

Deprecation

• Deprecate all codiagonal except Lens.codiagonal (#1115) @julien-truffaut
• Deprecate first, second, left, right, split. Move choice to cats instance (#1114) @julien-truffaut
• deprecate symbolic compose operators (#983) @julien-truffaut
• deprecate generic and state module - no replacement (#986) @julien-truffaut
• deprecate Possible- no replacement (#992) @julien-truffaut
• deprecate Cons, Cons1, Snoc, Snoc1 - no replacement (#984) @julien-truffaut
• deprecate Curry, Empty, Reverse - no replacement (#980) @julien-truffaut

Documentation

• enable scalajs-mapSourceURI option if Scala 3 (#1107) @xuwei-k
• add source links to scala 3 documentation. (#1108) @romanowski

Dependency upgrade

• Update Scala to 3.0.0 and 2.13.5
• Update cats to 2.6.1
• Update refined to 0.9.26
• Update scalajsto 1.6.0