Alessandro Martin alessandro-martin

YouTube video stream format codes

Comprehensive list of YouTube format code itags

itag Code	Container	Content	Resolution	Bitrate	Range	VR / 3D
5	flv	audio/video	240p	-	-	-
6	flv	audio/video	270p	-	-	-
17	3gp	audio/video	144p	-	-	-
18	mp4	audio/video	360p	-	-	-
22	mp4	audio/video	720p	-	-	-

DEPRECATED for Xcode 10 🎈

(check out What's New in Swift at 11:40, slide 42)

Whole Module Compilation Optimizations: Why these terms are sometimes misleading

When you look up how to compile swift faster for debug builds, people very earnestly give advice that seems contradictory: you should "try using the whole module optimization flag," and also "never use whole module optimization for debugging". [^1]

This is confusing because some of us are using these two general words:

compilation: "turning text into an executable program"

libdispatch efficiency tips

The libdispatch is one of the most misused API due to the way it was presented to us when it was introduced and for many years after that, and due to the confusing documentation and API. This page is a compilation of important things to know if you're going to use this library. Many references are available at the end of this document pointing to comments from Apple's very own libdispatch maintainer (Pierre Habouzit).

My take-aways are:

You should create very few, long-lived, well-defined queues. These queues should be seen as execution contexts in your program (gui, background work, ...) that benefit from executing in parallel. An important thing to note is that if these queues are all active at once, you will get as many threads running. In most apps, you probably do not need to create more than 3 or 4 queues.
Go serial first, and as you find performance bottle necks, measure why, and if concurrency helps, apply with care, always validating under system pressure. Reuse

Since the introduction of the append built-in, most of the functionality of the container/vector package, which was removed in Go 1, can be replicated using append and copy.

Here are the vector methods and their slice-manipulation analogues:

AppendVector

a = append(a, b...)

Copy

Things I believe

This is a collection of the things I believe about software development. I have worked for years building backend and data processing systems, so read the below within that context.

Agree? Disagree? Feel free to let me know at @JanStette.

Fundamentals

Keep it simple, stupid. You ain't gonna need it.

	import Foundation

	// A lens is a getter and a setter combined
	struct Lens<Whole, Part> {
	let get: (Whole) -> Part
	let set: (inout Whole, Part) -> ()
	}

	// We can create a lens from a key path
	extension Lens {

	0-mail.com
	007addict.com
	020.co.uk
	027168.com
	0815.ru
	0815.su
	0clickemail.com
	0sg.net
	0wnd.net
	0wnd.org

	// Eat/seek/peek

	extension Collection where SubSequence == Self, Element: Equatable {
	mutating func eat() -> Element {
	defer { self = self.dropFirst() }
	return peek()
	}
	mutating func eat(_ n: Int) -> SubSequence {
	let (pre, rest) = self.seek(n)
	defer { self = rest }


	/// Conform references types for use in the COW wrapper to this protocol
	protocol Cowable: class {
	/// Make a new unique instance of `copied`
	static func makeUnique(_ copied: Self) -> Self
	}

	/// A wrapper that turns a Cowable reference type into a value-semantic
	/// type with access to all of its properties
	@dynamicMemberLookup

	import UIKit

	#if canImport(SwiftUI) && DEBUG
	import SwiftUI
	struct UIViewControllerPreview<ViewController: UIViewController>: UIViewControllerRepresentable {
	let viewController: ViewController

	init(_ builder: @escaping () -> ViewController) {
	viewController = builder()
	}