zeeshankhan

class A {
    var x = "a"
}

var a: A = A()
isUniquelyReferencedNonObjC(&a)

var b = a
isUniquelyReferencedNonObjC(&a)

zeeshankhan

protocol QueueType {
    typealias Element
    mutating func enqueue(element: Element)
    mutating func dequeue() -> Element?
    func peek() -> Element?
}

final class Storage<Element> {

zeeshankhan

// Check If a string has all unique characters, without using additional data structure.
func isUnique(string: String) -> Bool {

    // what type of characters    // if ascii characters
    if string.characters.count > 128 {
        return true
    }

    var cIdx = 0
    for c in string.characters {

zeeshankhan

let staionary = ["Black Pen", "Blue Pen", "Red Pen", "Green Pen", "Notebook", "Science Book", "Physics Book", "Maths Book", "CD", "Laptop", "Flopy Disk", "Keyboard", "Mouse", "mac OS", "iOS", "LinuxOS", "AndroidOS", "tvOS", "watchOS", "WindowsOS", "iPad", "iPhone", "iPod"]

let books = staionary.filter { (item: String) -> Bool in
    return item.containsString("Book")
}

let pens = staionary.filter { (item) in
    return item.containsString("Pen")
}

zeeshankhan

import Foundation

let x: String? = nil
let y: String? = "Hello Y"

switch (x,y) {
    case (.some(let a), .some(let b)):
        print("So \(a) and \(b)")
    case (.none, .none):
        print("None")

zeeshankhan

// A Gist.
struct Gist {
    let id: String
}

typealias JSONDictionary = [String: AnyObject]

// These methods are "helpers" to transform Data -> JSON -> Result<[Gist]> 
func jsonFrom(data: Data) -> Result<AnyObject> {
    let json = try! JSONSerialization.jsonObject(with: data, options: [])

zeeshankhan

import Foundation
import XCPlayground
XCPlaygroundPage.currentPage.needsIndefiniteExecution = true

typealias JSONDictionary = [String: Any]

enum SomeError : Error {
    case zoError
}

zeeshankhan

// How to:
// 1. Go in the Firebase Analytics Dashboard
// 2. Filter iOS Platform only
// 3. Scroll down, select `Device` under the "What is your audience like?" widget
// 4. Export the CSV data (top right of the corner, there's a `...` menu with Download CSV option)
// 5. Open the file and select the iOS breakdown raw data
// 6. Replace your data with the sample data in this script
// 7. Run the script in a Xcode Playground
// 8. See the terminal output

zeeshankhan

# 1. Open Terminal.app.
# 2. Type "cd Desktop" and Enter.
# 3. Type "open ~/Library/Safari/ ." and Enter.
# 4. Copy `Bookmarks.plist` file to the Desktop.
# 5. Back to the Terminal, type "ruby safari-readling-list-to-instapaper-csv.rb" and Enter.
# 6. Open Instapaper Settings (https://www.instapaper.com/user), and select "Import from Instapaper CSV."
# 7. Upload `instapaper-import.csv` from the Desktop.

require "plist"
require 'csv'

zeeshankhan

import SwiftUI
import PlaygroundSupport

struct ContentView: View {
    @State var gradientAngle: Double = 0
    var colors = [
        Color(UIColor.systemRed),
        Color(UIColor.systemOrange),
        Color(UIColor.systemYellow),
        Color(UIColor.systemGreen),