efremidze

extension Array {
    
    subscript(safe index: Int, repeated repeated: Bool) -> Element? {
        return isEmpty ? nil : self[index % count]
    }
    
}

efremidze

protocol Storable {}
extension Storable {
    var storedValue: Any? {
        get { return UserDefaults.standard["value"] }
        nonmutating set { UserDefaults.standard["value"] = newValue }
    }
}
struct Storage: Storable {}
let storage = Storage()
storage.storedValue = "🐼"

efremidze

extension UIView {
    
    func superview<T>(of type: T.Type) -> T? {
        return superview as? T ?? superview.flatMap { $0.superview(of: T.self) }
    }
    
}

efremidze

extension UInt32 {
    
    static func random(_ range: Range<UInt32>) -> UInt32 {
        return arc4random_uniform(range.upperBound - range.lowerBound) + range.lowerBound
    }
    
}

extension CGFloat {
    

efremidze

extension Array where Element: _ArrayType, Element.Generator.Element: AnyObject? {
    
    func flatten() {
        return flatMap { $0.flatMap { $0 } }
    }
    
}

efremidze

extension Optional {
    
    func unwrap(_ f: (Wrapped) -> Void) {
        _ = self.map(f)
    }
    
}

// usage:
// let username: String?

efremidze

@warn_unused_result
func Init<T>(value: T, @noescape block: (object: T) -> Void) -> T {
    block(object: value)
    return value
}

efremidze

func propertyNames(forClass: AnyClass) -> [String] {
    var count = UInt32()
    let properties = class_copyPropertyList(forClass, &count)
    let names: [String] = (0..<Int(count)).flatMap { i in
        let property: objc_property_t = properties[i]
        guard let name = NSString(UTF8String: property_getName(property)) as? String else {
            debugPrint("Couldn't unwrap property name for \(property)")
            return nil
        }
        return name

efremidze

// MARK: - CABasicAnimation
extension CABasicAnimation {
    
    /// Creates a new animation object with its `keyPath` property set to `path` and current `keyPath` value set to `fromValue`.
    convenience init(keyPath path: String, layer: CALayer) {
        self.init(keyPath: path)
        self.fromValue = layer.presentation()?.value(forKeyPath: path)
    }
    
}

efremidze

extension UIFont {
    
    func bold() -> UIFont? {
        return fontDescriptor.withSymbolicTraits(.traitBold).map { UIFont(descriptor: $0, size: 0) }
    }
    
}