Zack Zhu thornpig

In this example

Multiline input can be caputured by spreading openening and closing quote accross lines
Newlines can be replaced using built-in bash text substitution
The main trick is knowing that $'\n' is the way to specify the newling within the subsitution
Note, echo output of a var without quotation replaces newlines with spaces

$ t='1
> 2

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

Clarify and agree on the scope of the system

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

Here's my own list of the interesting stuff announced during this year's WWDC, collected from the keynotes, various Apple docs, blog posts and tweets.

If you're planning to watch the videos, I really recommend this Mac app that helps you download and watch them: https://github.com/insidegui/WWDC.

OS X El Capitan

http://www.apple.com/osx/elcapitan-preview/

split view - two apps side by side on full screen

Things to remember when compiling/linking C/C++ software

by Angel Leon. March 17, 2015;

Last update on December 14, 2023

Updated on February 27, 2023

Updated August 29, 2019.

Hacking UIView animation blocks for fun and profit

In this article, I'm going to explore a way that we can create views that implement custom Core Animation property animations in a natural way.

As we know, layers in iOS come in two flavours: Backing layers and hosted layers. The only difference between them is that the view acts as the layer delegate for its backing layer, but not for any hosted sublayers.

In order to implement the UIView transactional animation blocks, UIView disables all animations by default and then re-enables them individually as required. It does this using the actionForLayer:forKey: method.

Somewhat strangely, UIView doesn't enable animations for every property that CALayer does by default. A notable example is the layer.contents property, which is animatable by default for a hosted layer, but cannot be animated using a UIView animation block.

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

	import Cocoa

	// When you’re downloading objects from the web, it’s common to need to merge changes
	// from the server to already-existing local objects. (If your data model allows for
	// mutable objects, as with Core Data, that is.)
	//
	// The below is a Swift translation of how I’ve done this in Objective-C.
	// Note that it works just fine in Swift — though it does require NSObject subclasses.

	The MIT License (MIT)

	Copyright (c) 2016 Zev Eisenberg

	Permission is hereby granted, free of charge, to any person obtaining a copy of
	this software and associated documentation files (the "Software"), to deal in
	the Software without restriction, including without limitation the rights to
	use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
	the Software, and to permit persons to whom the Software is furnished to do so,
	subject to the following conditions:

	enum Color { case R, B }

	indirect enum Tree<Element: Comparable> {
	case Empty
	case Node(Color,Tree<Element>,Element,Tree<Element>)

	init() { self = .Empty }

	init(_ x: Element, color: Color = .B,
	left: Tree<Element> = .Empty, right: Tree<Element> = .Empty)

	/*
	* This is an example provided by Facebook are for non-commercial testing and
	* evaluation purposes only.
	*
	* Facebook reserves all rights not expressly granted.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
	* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NON INFRINGEMENT. IN NO EVENT SHALL
	* FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN

	// It's tested on ios 8.2 ..

	// Apple document about virtual memory:
	// Both OS X and iOS include a fully-integrated virtual memory system that you cannot turn off; it is always on.
	// https://developer.apple.com/library/mac/documentation/Performance/Conceptual/ManagingMemory/Articles/AboutMemory.html
	// Discussing mmap on ios:
	// http://stackoverflow.com/questions/13425558/why-does-mmap-fail-on-ios
	// http://stackoverflow.com/questions/9184773/is-there-a-practical-limit-on-the-number-of-memory-mapped-files-in-ios

	#include <sys/mman.h>