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Sami Samhuri
007b1058b6
Replace the Swift site generator with a Ruby and Phlex implementation. Loads site and projects from TOML, derive site metadata from posts. Migrate from make to bake and add standardrb and code coverage tasks. Update CI and docs to match the new workflow, and remove unused assets/dependencies plus obsolete tooling.
36 lines
1.1 KiB
Markdown
36 lines
1.1 KiB
Markdown
---
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Author: Sami Samhuri
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Title: "A nil-coalescing alternative for Swift"
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Date: "6th October, 2017"
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Timestamp: 2017-10-06T14:20:13-07:00
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Tags: iOS, Swift
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---
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Swift compile times leave something to be desired and a common culprit is the affectionately-named [nil-coalescing operator][nilop]. A small extension to `Optional` can improve this without sacrificing a lot of readability.
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```swift
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extension Optional {
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func or(_ defaultValue: Wrapped) -> Wrapped {
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switch self {
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case .none: return defaultValue
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case let .some(value): return value
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}
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}
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}
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```
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And you use it like so:
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```swift
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let dict: [String : String] = [:]
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let maybeString = dict["not here"]
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print("the string is: \(maybeString.or("default"))")
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let otherString = dict["not here"].or("something else")
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```
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I'm sure someone else has come up with this already but I haven't seen it yet.
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_([gist available here][gist])_
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[nilop]: https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/BasicOperators.html#//apple_ref/doc/uid/TP40014097-CH6-ID72
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[gist]: https://gist.github.com/samsonjs/c8933c07ad985b74aba994f2fdab8b47
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