Created
July 15, 2018 18:24
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| struct Lens<A,B> { | |
| let from : A -> B | |
| } | |
| let firstname = Lens<Contact, String>(from: { $0.user.firstname }) | |
| ... | |
| let myContact = Contact(user: User(firstname: "James", lastname: "Kirk"), | |
| isConnected: true) | |
| firstname.from(myContact) // will return "James" |
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