trilliwon

extension Array where Element: Hashable {

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

trilliwon

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

trilliwon

- (void)setupCaptureSession 
{
    NSError *error = nil;
    AVCaptureSession *session = [[AVCaptureSession alloc] init];

    session.sessionPreset = AVCaptureSessionPresetMedium;

    AVCaptureDevice *device = [AVCaptureDevice
                           defaultDeviceWithMediaType:AVMediaTypeVideo];

trilliwon

import Foundation

// MARK: Creating Array

var someInts = [Int]()
print("someInts is of type [Int] with \(someInts.count) items.")
// Prints "someInts is of type [Int] with 0 items."

someInts.append(3)
// someInts now contains 1 value of type Int

trilliwon

print("Swift is awesome ;;")
print("Swift", "is", "awesome", separator:" ")
print("Swift", "is", "awesome", separator:" ", terminator:".")

// Console
// Swift is awesome ;;
// Swift is awesome
// Swift is awesome.

trilliwon

func rowAndCol(s: Int, N: Int) -> (Int, Int) {
    var s = s - 1
    var row = N - (s / N) - 1
    var col = row % 2 != N % 2 ? s % N : N - 1 - (s % N)
    return (row, col)
}

let range = 0..<N
for row in range.reversed() {
    let reversed: [Int] = range.reversed()

trilliwon

func isAlpha(char: Character) -> Bool {
    switch char {
    case "a"..."z":
        return true
    case "A"..."Z":
        return true
    default:
        return false
    }
}

trilliwon

UIView.transition(with: self.backgroundImageView,
                  duration: 0.7,
                  options: [.transitionCrossDissolve],
                  animations: { self.backgroundImageView.image = toImageA },
                  completion: { _ in swap(&toImageA, &toImageB) })
}

trilliwon

xcrun simctl io booted screenshot 1r.png

xcrun simctl io booted recordVideo apppreview.mp4
ctrl + c # to stop
# https://shashikantjagtap.net/simctl-control-ios-simulators-command-line/

trilliwon

//
//  ViewController.swift
//  Playback
//
//  Created by kyle.jo on 12/12/2018.
//  Copyright © 2018 kyle.jo. All rights reserved.
//

import AVFoundation
import UIKit