https://github.com/mokagio/Swift-Functor-Introduction-Playground

A playground to introduce Functors in Swift, and their practical usage. From my Melbour CocoaHeads #85 lighting talk.
https://github.com/mokagio/Swift-Functor-Introduction-Playground

Last synced: 2 months ago
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A playground to introduce Functors in Swift, and their practical usage. From my Melbour CocoaHeads #85 lighting talk.

• Host: GitHub
• URL: https://github.com/mokagio/Swift-Functor-Introduction-Playground
• Owner: mokagio
• Created: 2015-07-12T01:59:08.000Z (almost 9 years ago)
• Default Branch: master
• Last Pushed: 2015-07-12T01:59:48.000Z (almost 9 years ago)
• Last Synced: 2024-04-11T18:22:33.271Z (3 months ago)
• Language: Swift
• Size: 121 KB
• Stars: 6
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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• Awesome-Swift-Playgrounds - Functors in Swift - A playground to introduce Functors in Swift, and their practical usage. ⏳ (Theoretical Computer Science / Functional Reactive Programming)

README

        
# Functors in Swift - A simple introduction

> Note: This Playground is written in Swift 2.0 and Xcode 7 Beta 3.

This is the playground for my lightning talk at [July's 2015 Melbourne CocoaHeads](http://www.melbournecocoaheads.com/).

The talk is a simple introduction to Functors and Monads in Swift, focusing on the practical use of these concepts, rather than their mathematical definition.

The cool things about Functors and Monads are `map` and `flatMap`. Using these we can simplify code like this:

```swift

func getFancyEmojiForUser() -> String? {

  if let actuallyAUser = userFromDatabase() {

    let joinedUserName = joinedName(actuallyAUser)

    if let emojiForUser = emojiFromString(joinedUserName) {

      return fancifyEmoji(emojiForUser)

    }

  }

  return .None

}

```

into something that is easier to write and specially **easier to reason about**.

```swift

func getFancyEmojiForUser() -> String? {

  return userFromDatabase()

    .map(joinedName)

    .flatMap(emojiFromString)

    .map(fancifyEmoji)

}

```

If you are interested in this tweet me [@mokagio](https://twitter.com/mokagio) or visit [mokacoding](http://mokacoding.com)

---

(c) 2015 - Giovanni Lodi