Abdul aralshawa

iPad Pro 12.9" (2020) Magic Keyboard Portrait Mode DIY Smart Connector Cable

I wanted my iPad Pro to be able to use the Magic Keyboard in portrait mode, but the current Smart Connector configuration does not allow this. With too much time on my hands, I made a short jumper cable using a section of USB cable, 5-pin POGO connectors (the 5-pin works using pins 1, 3, and 5, and removing pins 2 and 4), a small electrical project box, 3mm N52 magnets, and some epoxy and Sugru to pack everything into place. My cable and connections orientation had more to do with the boxes I found to encase the connector (with holes on the small end) than anything else. Obviously, there will be many ways to do this.

WARNING: Getting any of these steps wrong will probably ruin your iPad.

Note: These measurements are for the 12.9" (2020) model. The magnets did not line up and the polarity was different for my wife's iPad Pro 11" (2021).

![iPad-Pro-MmagicKeyboard-Jumper-Cable-min](https://user-images.githubusercontent.c

See the official Differentiable Programming Manifesto instead.

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

Taking website screenshots

These are instructions for taking screenshots of an entire webpage, not just the part of the webpage visible in the browser.

Website Screenshots in Safari

This requires Safari 11.3, which comes on macOS 10.3.4.

Open the website in Safari
If needed, go Safari > Preferences > Advanced > Show Develop Menu in Menu Bar

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

-E: will describe the underlaying queries of the \ commands (cool for learning!)
-l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

	//: Playground - noun: a place where people can play

	import Foundation

	final class Disposable {
	private let dispose: () -> ()
	init(_ dispose: @escaping () -> ()) {
	self.dispose = dispose
	}

	# LVDB - LLOOGG Memory DB
	# Copyriht (C) 2009 Salvatore Sanfilippo <[email protected]>
	# All Rights Reserved

	# TODO
	# - cron with cleanup of timedout clients, automatic dump
	# - the dump should use array startsearch to write it line by line
	# and may just use gets to read element by element and load the whole state.
	# - 'help','stopserver','saveandstopserver','save','load','reset','keys' commands.
	# - ttl with milliseconds resolution 'ttl a 1000'. Check ttl in dump!

	import UIKit

	class NRLabel : UILabel {

	var textInsets = UIEdgeInsets.zero {
	didSet { invalidateIntrinsicContentSize() }
	}

	override func textRect(forBounds bounds: CGRect, limitedToNumberOfLines numberOfLines: Int) -> CGRect {
	let insetRect = UIEdgeInsetsInsetRect(bounds, textInsets)

	/----------------------------------------------------/
	#pragma mark - XCTAsserts
	/----------------------------------------------------/

	XCTAssert(expression, format...);
	XCTAssertTrue(expression, format...);
	XCTAssertFalse(expression, format...);
	XCTAssertEqual(expression1, expression2, format...);
	XCTAssertNotEqual(expression1, expression2, format...);
	XCTAssertNil(expression, format...);

	//
	// MultiDirectionAdjudicatingScrollView.swift
	// Khan Academy
	//
	// Created by Andy Matuschak on 12/16/14.
	// Copyright (c) 2014 Khan Academy. All rights reserved.
	//

	import UIKit
	import UIKit.UIGestureRecognizerSubclass