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indirect enum LinkedListNode {
    case head(value: Int, node: LinkedListNode)
    case node(value: Int, next: LinkedListNode)
    case tail(value: Int)
}

let linkedList = LinkedListNode
    .head(value: 0, node:
            .node(value: 1, next:
                    .node(value: 2, next:

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Hexadecimal color code for transparency

How to set transparency with hex value ?

For example, you want to set 40% alpha transparence to #000000 (black color), you need to add 66 like this #66000000.

Download This sample on Google Play Store

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“apple-app-site-association” file

One file for each domain, both www.example.com and example.com need separate files:

{
    "applinks": {
        "apps": [],
        "details": {
 "9JA89QQLNQ.com.apple.wwdc": {

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import LocalAuthentication

class BiometricAuth {
    
    var context = LAContext()
    var error: NSError?
    
    
    func auth(_ completion: @escaping (_ success: Bool) -> ()) {
        // Get the supported biometry

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import RealmSwift

extension Results {
    
    func toArray() -> [T] {
        return self.map{ $0 }
    }
    
}

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import RealmSwift

internal struct RealmService {
    
    private static var realm: Realm? {
        do {
            return try Realm()
        } catch let error as NSError {
            print(error)
            return nil

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import UIKit

extension UIColor {

    /// Creates image from color
    /// - Parameter size: size of returned image
    /// - Returns: UIImage
    func image(_ size: CGSize = CGSize(width: 1, height: 1)) -> UIImage {
        return UIGraphicsImageRenderer(size: size).image { rendererContext in
            self.setFill()

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import Foundation

public extension Date {

    // MARK: - Convert from String

    /*
        Creates a new Date based on a string of a specified format. Supports optional timezone and locale.
    */
    init?(fromString string: String, format: DateFormatType, timeZone: TimeZoneType = .local, locale: Locale = Foundation.Locale.current, isLenient: Bool = true) {

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import UIKit
import CoreText
import XCPlayground

let font = UIFont(name: "HelveticaNeue", size: 46)! // Choose font

var allPathes = [CGPath]()
var unichars = [UniChar]("i".utf16) //Insert text
var glyphs = [CGGlyph](repeating: 0, count: unichars.count)
let gotGlyphs = CTFontGetGlyphsForCharacters(font, &unichars, &glyphs, unichars.count)