Donny Wals donnywals

Daniel Sternberg - Ready for the future

Objective-C is not dead, it’s awesome, it’s a lovely language but you just won’t find a job if stick to it.
Daniel misses the Objective-C’s * in Swift. Because that way he knows that something is (or isn’t) a reference type. He also misses header files because those are nice overviews of what he can call in a certain class. Otherwise, he loves Swift.
Context is important in code. If you would want to get timeIntervalUntilNow you need the inverse of timeIntervalSinceNow because the latter would return a negative number. Just putting a - in front of it somewhere is bad, because there’s no context. Wrapping it in a method, - is okay to put there. That provides context. So timeIntervalUntilNow would just return -timeIntervalSinceNow.
Translating things from Objective-C to Swift is not thinking in Swift. Thinking in Swift doesn’t mean monads, map, flatmap, reduce and all the haskell stuff.
If you use protocols, like SequenceType you get a lot

Basic commands

If you're not sure how to use a command or what options it has you can always do: 'man :command_name' to see the manual for that command (example: man cd)

Folders

Switching folders: cd :folder_name:
Move up one folder: cd ..
Going to the home folder: cd ~
See folder contents: ls
See readable folder contents: ls -la (-la are options for the ls command)

What’s new in Cocoa Touch

Table view

Look at expensiveness of tableView(_:cellForRowAt:), often quite expensive.
layoutSubviews for cells can be quite expensive too.
Prefetching can be a big win, but not always
Two cells could be fighting for the CPU with prefetching. iOS 12 is smarter about this.
Better CPU ramping up

Automatic Backing Store

What’s new in ARKit 2

Relocalization from 11.3 allows a session to be restored. Uses a map that is supplied by world tracking.
In iOS 12 you can get a mapping of a physical 3D space
Mutable list of named anchor so you can add your own anchors
Raw feature points and extent
World maps can be serialized (Codable?)
The world map can be loaded again when the user starts their AR experience.

Multi-user experiences

Introducing Create ML

Focus on images, text and tabular data
Folders as labels, images as data for that label
Transfer learning is used in Create ML by using an existing image classifier, augmented with your data
This is a real quick way of training
Playground is used to provide a UI for machine learning
MLModelImageClassifierBuilder
Available on Mojave

Introduction to Siri Shortcuts

Shortcuts let you expose the capabilities of your apps to Siri

Siri suggestions will show siri shortcuts
Siri can suggest shortcuts on the watch
Shortcuts can be shown on the lock screen
Users can provide their own commands for shortcuts and developers can define their own responses
Developers suggest commands that the users can use
Shortcuts even work on HomePod

	fastlane_version "1.40.0"
	default_platform :ios

	platform :ios do

	before_all do
	ensure_git_status_clean
	end

	desc "Upload a new Crashlytics beta for quick testing"

	enum BSCellIdentifier: String {
	case ActiveGoalBased = "activeGoalbased"
	case ActiveTimeBased = "activeTimeBased"
	case ActiveWaiting = "activeWaiting"
	case Past = "past"

	static func identifierForChallenge(challenge: Challenge, inSection section: Int, withType type: SelectionType) -> String {
	if type == .Active {
	if section == 0 {
	if challenge.challengeType.isGoalBased() {

	var request = require('request');
	var cheerio = require('cheerio');
	var Promise = require('promise');
	var fs = require('fs');

	var url = 'http://eu.battle.net/sc2/en/game/unit/';
	request(url, function(err, res, html){
	if(err) {
	console.log('An error occurred');
	console.log(error);

	$(document).ready(function() {
	// Elke click handler krijgt een event object als argument binnen.
	// Dit event object bevat informatie of de click die gebeurt is, zoals
	// bijvoorbeeld het elemenet waarop geklikt is. Dit object is bereikbaar
	// via de target property van het event object. Als je die in een jquery
	// dollar ding wrapt kun je dus ook de hide functie aanroepen. Daarmee hide
	// je dus het plaatje waarop geklikt is in plaats van alleen de eerste :)
	$("img").click(function(event) {
	$(event.target).hide();
	});