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// Source: https://docs.swift.org/swift-book/ReferenceManual/Patterns.html#grammar_optional-pattern

let arrayOfOptionalInts: [Int?] = [nil, 2, 3, nil, 5]

for case let number? in arrayOfOptionalInts {
    print("Found a \(number)")
}

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import MapKit
import PlaygroundSupport

let mapView = MKMapView()
PlaygroundPage.current.liveView = mapView

CLGeocoder().geocodeAddressString("1 Apple Park Way, Cupertino, CA") {
    (places, _) in
    guard let places = places?.map(MKPlacemark.init) else { return }
    mapView.showAnnotations(places, animated: true)

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Africa/Abidjan
Africa/Accra
Africa/Addis_Ababa
Africa/Algiers
Africa/Asmara
Africa/Bamako
Africa/Bangui
Africa/Banjul
Africa/Bissau
Africa/Blantyre

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import Foundation

extension String {
    var guessedNameFromEmail: String? {
        return self.split(separator: "@").first?.split(separator: ".").map { $0.capitalized(with: Locale.autoupdatingCurrent) }.joined(separator: " ")
    }
}

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mmar

#!/bin/sh
git bundle create ~/Backups/`basename $PWD`.git --all

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let triangularNumbers = sequence(state: (0,0)) { (state: inout (Int,Int)) -> Int in
    state = (state.0 + 1, state.1 + state.0 + 1 )
    return state.1
}

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let pascalsTriangle = sequence(first: [1]) {
    zip([0] + $0, $0 + [0]).map(+)
}