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extension String {
    subscript(i: Int) -> Character? {
        guard i < self.count else {
            return nil
        }
        return self[self.index(self.startIndex, offsetBy: i)]
    }
}

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extension Array where Element: Hashable {

    func counter() -> [Element: Int] {
        return self.reduce(into: [:]) { counts, elem in counts[elem, default: 0] += 1 }
    }
}

trilliwon

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

trilliwon

// class UINotificationFeedbackGenerator
let notificationFeedback = UINotificationFeedbackGenerator()
notificationFeedback.notificationOccurred(.success) // .warning, .error

// class UIImpactFeedbackGenerator
let impactFeedback = UIImpactFeedbackGenerator(style: .light) // .medium, .heavy
impactFeedback.impactOccurred()

// class UISelectionFeedbackGenerator
let selectionFeedback = UISelectionFeedbackGenerator()

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override func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {

    let share = UIContextualAction(style: .normal, title: "Share") { action, view, completion in
        completion(true)
    }

    let delete = UIContextualAction(style: .destructive, title: "Delete") { [weak self] action, view, completion in
        self?.langs.remove(at: indexPath.row)
        tableView.deleteRows(at: [indexPath], with: UITableViewRowAnimation.automatic)

trilliwon

import UIKit

class FadeInOutUnwind: UIStoryboardSegue {

  override func perform() {

    let sourceView: UIView = self.source.view as UIView!
    let destinationView: UIView = self.destination.view as UIView!

    sourceView.alpha = 1.0

trilliwon

import UIKit

class FadeInOut: UIStoryboardSegue {

  override func perform() {

    let sourceView: UIView = self.source.view as UIView!
    let destinationView: UIView = self.destination.view as UIView!

    sourceView.alpha = 1.0

trilliwon

import UIKit

class ToLeftSegueUnwind: UIStoryboardSegue {

  override func perform() {

    let sourceView = self.source.view as UIView!
    let destinationView = self.destination.view as UIView!

    let screenWidth = UIScreen.main.bounds.size.width

trilliwon

import UIKit

class ToLeftSegue: UIStoryboardSegue {

  override func perform() {

    let sourceView = self.source.view as UIView!
    let destinationView = self.destination.view as UIView!

    let screenWidth = UIScreen.main.bounds.size.width

trilliwon

#!/bin/sh

echo "generating I18N.swift"

touch tempI18N.swift
echo "struct I18N {" >> tempI18N.swift

inputfile=${SRCROOT}/Pomodoro/Resources/en.lproj/Localizable.strings
while IFS= read -r line