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typealias DownloadResult = (items: [String], error: Error?)

func load() -> DownloadResult {
    func dowload() -> DownloadResult {
        return (["Zips"], nil)
    }
    
    let nestedFunction = dowload()
    
    return nestedFunction

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/*
{ (parameters) -> return type in
    statements
}
*/

let BoolClosure: (Bool) -> Void = { parameter in
    print("\(parameter)")
}

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let integers = [1, 2, 3, 4, 5]
/*
Inferring Type From Context
Compile already know the result is String array
*/
/*
Implicit Returns from Single-Expression Closures
Just String($0)
*/
/*

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/* The animate function
UIView.animate(withDuration: TimeInterval, animations: () -> Void)
*/
// Can be
UIView.animate(withDuration: 0.25, animations: { (_) in
    
})
// Simpler, just use trailing
UIView.animate(withDuration: 0.25) {
    // statement

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final class Model {
    
    func load(completion: @escaping ([String]) -> Void) {
        // statement
    }
    
}

final class ViewController: UIViewController {
    

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func patch(user: @autoclosure () -> User) {
    // statement
}

patch(user: "Maxim")
patch { "Mike" }

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import UIKit.UIColor

extension UIColor {
    
    convenience init(hex: String) {
        // Initializer supports work with formatts: "#FFFFFF", "FFFFFF"
        let cString: String = hex.trimmingCharacters(in: .whitespacesAndNewlines)
            .uppercased()
            .replacingOccurrences(of: "#", with: "")
        

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import UIKit.UIColor

extension UIColor {
    
    static let common = UIColor(hex: "#B11835")
    static let commonText = UIColor(hex: "#114747")
    static let commonActionBackground = UIColor(hex: "#119C84")
    static let commonActionText = UIColor(hex: "#110808")
    static let positive = UIColor(hex: "#11C7C1")
    static let negative = UIColor(hex: "#118475")

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    @IBInspectable
    var activeSegmentColor: UIColor = .segmentActiveBackground
    
    @IBInspectable
    var textColor: UIColor = .segmentText
    
    @IBInspectable
    var activeTextColor: UIColor = .segmentActiveText

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enum EmailValidationError {
    // TODO: - Cases
    case empty
    // TODO: - Cases can be declared on a single line
    case noDomain, invalid
}