Improving Optionals

All problems can be solved by adding another protocol

Russ Bishop
January 19, 2017

Optionals are great. I've tracked down too many bugs to Objective-C's magical "messages to nil return nil"; I have no interest in going back.

But sometimes there are things you want to do with optionals or when optionals are of a specific type. Here are some of my favorites:

isNilOrEmpty

Sometimes . . .

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Quick: Easy DispatchTime

Expressin' me some literals

Russ Bishop
November 10, 2016

Here's a quick bonus post. I find using DispatchTime a bit less convenient than it should be. In a GUI application I almost always just want to specify a TimeInterval, aka number of whole or fractional seconds.

Thankfully Swift extensions can grant my heart's desire:

extension DispatchTime: ExpressibleByIntegerLiteral { . . .

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Mixing Initializers

init? init! init throws

Russ Bishop
November 09, 2016

Today is a really simple post but something people struggle with, often in the context of extensions or interacting with RawRepresentable enums.

Can't delegate to failable initializer

Let's say you have a type with a failable initializer. Now you want to extend that type to support deserializing from JSON. You throw . . .

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The Technical Fraternity

Let's get real

Russ Bishop
October 13, 2016

When I read @RedQueenCoder's blog post... it really angried up my blood.

To all of you claiming knowledge of data structures is some kind of signal in interviews? Stop it.

Seriously.

It isn't reasonable to expect a candidate to derive that elegant solution it took two PhDs 8 months to discover.

. . .

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Command Line Swift

#!/usr/bin/awesome

Russ Bishop
September 21, 2016

This post is mostly a brain dump of what it takes to use Swift for command line scripting.

Update: I've added -S to env. This makes things compatible with recent versions of FreeBSD. There doesn't appear to be a portable solution for Linux because it treats the entire line after the first space as a single argument rather . . .

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Inception

I came to remind you of what you once knew

Russ Bishop
September 09, 2016

Bar Ziony was asking about using type erasure to create a property that can contain any possible adopter of a protocol, but without using generics. I posted a gist but wanted to go over it in more detail, plus answer some follow-up questions.

Prerequisites

We'll start with a protocol and two types that adopt the . . .

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Apple File System

Ding

Russ Bishop
June 15, 2016

Update

Ars has some updated information, including details about the snapshotUtil apfs_snapshot utility.

Original

The Apple File System is still a slightly mysterious beast. Apple has reason to be cautious: A new file system is always a huge undertaking and the risks couldn't be higher: a serious bug can cause . . .

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