https://github.com/dragisak/monocle-cats

Monocle Lenses and Cats State
https://github.com/dragisak/monocle-cats

cats monocle scala

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Monocle Lenses and Cats State

• Host: GitHub
• URL: https://github.com/dragisak/monocle-cats
• Owner: dragisak
• License: mit
• Created: 2015-08-01T21:05:47.000Z (over 9 years ago)
• Default Branch: master
• Last Pushed: 2019-09-12T21:42:33.000Z (over 5 years ago)
• Last Synced: 2023-06-30T04:41:48.795Z (over 1 year ago)
• Topics: cats, monocle, scala
• Language: Scala
• Size: 39.1 KB
• Stars: 5
• Watchers: 1
• Forks: 3
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Monocle Lenses and Cats State

[![Build Status](https://travis-ci.org/dragisak/monocle-cats.svg)](https://travis-ci.org/dragisak/monocle-cats) 

[![Coverage Status](https://coveralls.io/repos/dragisak/monocle-cats/badge.svg?branch=master&service=github)](https://coveralls.io/github/dragisak/monocle-cats?branch=master)

[![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.dragishak/monocle-cats_2.13/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.dragishak/monocle-cats_2.13) 

This library brings together [Monocle Lenses](http://julien-truffaut.github.io/Monocle/)  and [Cats](https://typelevel.org/cats/) project.

## Use

```scala

libraryDependencies += "com.dragishak" %% "monocle-cats" % ""

```

## Version support matrix

Monocle   | Cats      | Scala            | monocle-cats 

----------|-----------|------------------|-----------------

1.2.2     | 0.7.2     | 2.10, 2.11       | 1.0

1.3.2     | 0.8.1     | 2.10, 2.11, 2.12 | 1.1    

1.4.0     | 0.9.0     | 2.10, 2.11, 2.12 | 1.2  

2.0.0     | 2.0.0     | 2.12, 2.13       | 1.3

## Example

```scala

import cats.monocle.syntax._

import cats.instances.all._

import monocle.macros.Lenses

@Lenses case class Address(street: String, city: String, zip: Int)

@Lenses case class Person(name: String, age:Int, address: Address)

val setStreet = Address.street := "13 Main St."

val incrementAge = Person.age += 1

val state = for {

  newStreetName <- Person.address %%= setStreet

  newAge        <- incrementAge

} yield (newStreetName, newAge)

val person = Person("Alice", 30, Address("1 Main St", "San Francisco", 94123))

val (changedPerson, (newStreet, newAge)) = state.run(person).value

```

## Copyright and License

All code is available to you under the MIT license, available at [http://opensource.org/licenses/MIT](http://opensource.org/licenses/MIT) and also

in the LICENSE file.

Copyright Dragisa Krsmanovic, 2019.