Swift 2 migration blog post

[ashfurrow]

Expectations vs reality, sore spots, easy wins, ways to avoid hard times migrating to Swift 2.1, reasons why to/to not migrate now, lessons learnt.

[ashfurrow]

This PR: artsy/eidolon#496

Ran the converter, which failed shortly after beginning.

Further ideas:

• isEmpty could have a corresponding isNotEmpty. (Done)
• OptionSets are cool 👍
• isEmpty should be able to be used on optional strings. (Done)
• UITextField has optional text property.
• No longer have to cast with objc generic arrays
• FLKAutoLayout/our own libraries could use objc generic arrays
• SSL thingy
• Quick/Nimble update was painless 🌟 only change: https://github.com/artsy/eidolon/pull/496/files#diff-99681ae03e7455abb84f2358ea7ae5f2R9
• As long as none of the Kiosk iPads are updated to iOS 9, we're fine.
• Operator precedence in RAC macros.

[modocache]

Quick/Nimble update was painless 🌟

Great!! Feedback always appreciated on other sore spots, feature requests, etc.

[ashfurrow]

🙇 Thanks Brian!

As for the isNotEmpty on (optional?) strings, the solution isn't that complex:

public protocol Occupiable {
    var isEmpty: Bool { get }
    var isNotEmpty: Bool { get }
}

public extension Occupiable {
    public var isNotEmpty: Bool {
        return !isEmpty
    }
}

extension String: Occupiable { }

public extension Optional where Wrapped: Occupiable {
    var isNilOrEmpty: Bool {
        return self?.isEmpty ?? false
    }

    var isNotNilNotEmpty: Bool {
        return !isNilOrEmpty
    }
}

I just don't know if this is a good idea. I mean, why not, eh? But it doesn't seem very idiomatic.

[ashfurrow]

Also, need to remove public everywhere. We have @testable now.