BasThomas

import UIKit

protocol Component: NSObjectProtocol {
    var accessibilityTraits: UIAccessibilityTraits { get set }
}

public final class SpecialComponent: UIView, Component {}

let mySpecialComponent: Component = SpecialComponent(frame: .zero)
mySpecialComponent.accessibilityTraits = .staticText

BasThomas

• defaults write com.apple.dt.Xcode IDEIndexerActivityShowNumericProgress -bool true

BasThomas

struct A: Hashable { }

struct B: Hashable { // error: type 'B' does not conform to protocol 'Hashable'
  let aa: [A]
}

BasThomas

#if swift(>=4.1)
#else
extension Collection {
  func compactMap<ElementOfResult>(
    _ transform: (Element) throws -> ElementOfResult?
  ) rethrows -> [ElementOfResult] {
    return try flatMap(transform)
  }
}
#endif

BasThomas

extension Collection where Element == Int, Index == Int {

    /// Calculates a moving average.
    /// - Parameter period: the period to calculate averages for.
    /// - Warning: the supplied `period` must be larger than 1.
    /// - Warning: the supplied `period` should not exceed the collection's `count`.
    /// - Returns: a dictionary of indexes and averages.
    func movingAverage(period: Int) -> [Int: Float] {
        precondition(period > 1)
        precondition(count > period)

BasThomas

import Foundation

extension Sequence where Element: Equatable {

    /// Returns a Boolean value indicating whether every element of the sequence
    /// is equal to the given element.
    func containsOnly(_ element: Element) -> Bool {
        var iterator = self.makeIterator()
        guard iterator.next() != nil else { return false }
        return first(where: { $0 != element }) == nil

BasThomas

import Foundation

struct Person: Codable {
  public let name: String
}

let person = Person(name: "Bas")
let payload = try JSONEncoder().encode(person)
let string = String(data: payload, encoding: .utf8) // {"name":"Bas"}
let decodedPerson = try JSONDecoder().decode(Person.self, from: payload) // Person(name: "Bas")

BasThomas

import UIKit

class VC: UIViewController {
  func formatter() -> DateFormatter {
    struct Formatter {
      static let f: DateFormatter = {
        let f = DateFormatter()
        f.dateStyle = .medium
        print("I am called just once")
        return f

BasThomas

let o1nil: Int? = nil
let o1: Int? = 1

func switcher(_ a: Int?, _ b: Int?) {
  switch (a, b) {
  case (nil, nil):
    print("nothing")
  case (let thing?, nil):
    print("lhs", thing)
  case (nil, let thing?):

BasThomas

import Foundation

URL(string: "https://en.wikipedia.org/wiki/Flesch–Kincaid_readability_tests#Flesch_reading_ease") // nil
URL(string: "https://en.wikipedia.org/wiki/Flesch-Kincaid_readability_tests#Flesch_reading_ease") // valid

URL(string: "https://en.wikipedia.org/wiki/Flesch–Kincaid_readability_tests#Flesch.E2.80.93Kincaid_grade_level") // nil
URL(string: "https://en.wikipedia.org/wiki/Flesch-Kincaid_readability_tests#Flesch.E2.80.93Kincaid_grade_level") // valid

"https://en.wikipedia.org/wiki/Flesch–Kincaid_readability_tests#Flesch_reading_ease" ==
"https://en.wikipedia.org/wiki/Flesch-Kincaid_readability_tests#Flesch_reading_ease" // false