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UIView *parentView, *childView;
[childView setFrame:({
    CGRect frame = childView.frame;

    frame.origin.x = (parentView.frame.size.width - frame.size.width) / 2.0;
    frame.origin.y = (parentView.frame.size.height - frame.size.height) / 2.0;

    CGRectIntegral(frame);
})];

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//
//  Device.swift
//  imHome
//
//  Created by Kevin Xu on 2/9/15. Updated on 6/20/15.
//  Copyright (c) 2015 Alpha Labs, Inc. All rights reserved.
//

import Foundation

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Concurrency in Swift: One approach

Author: Chris Lattner

Contents

• Introduction
• Overall Vision
• Part 1: Async/await: Beautiful asynchronous APIs
• Part 2: Actors: Eliminating shared mutable state

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//: Playground - noun: a place where people can play

import UIKit

var str = "Hello, playground"

import Foundation

func test(timeout: Double) {
  let queue = DispatchQueue(label: "test", attributes: .concurrent)

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//: Playground - noun: a place where people can play

import UIKit
import PlaygroundSupport

let testList = ["a", "b", "c", "d"]
let tokenStr = testList.joined(separator: ", ")
tokenStr

let multiLanguageAddressList =

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extension String {
  func remove(stringList: [String]) -> String {
    return stringList.reduce(self) {
      return $0.replacingOccurrences(of: $1, with: "")
    }
  }
}

let testEmStr = "<em>#<\\/em>swift"
let trimStr = testEmStr.remove(stringList:["<em>", "<\\/em>"])

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//: Playground - noun: a place where people can play

import Foundation

extension String {
  var hasNumeric: Bool {
    return self.rangeOfCharacter(from: .decimalDigits) != nil
  }
  
  var isNumeric : Bool {

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let mapStr = ["test"].reduce("", +)
mapStr
let mapStr2 = ["test"].joined()
mapStr2
let mapStr3 = ["test"].joined(separator: "")
mapStr3

extension String {
  func removeDayzSearchCountSuffix() -> String {
    if self.trimmingCharacters(in: .whitespacesAndNewlines).components(separatedBy: " (").count > 1 {

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import UIKit
import PlaygroundSupport

func += <K, V> (left: inout [K:V], right: [K:V]) {
  for (k, v) in right {
    left[k] = v
  }
}

func + <K,V>(left: Dictionary<K,V>, right: Dictionary<K,V>)

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//: Playground - noun: a place where people can play

import UIKit
import PlaygroundSupport

var freeV = 0
func recur(input: Int, completion: @escaping (Int) -> Void) -> Int {
  DispatchQueue.global().async {
    print("FOR: is main thread? : ", Thread.isMainThread)
    for i in (input * 10)...(input * 100) {