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System Design Cheatsheet

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

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?

duplicates = multiple editions

Hello software developers,

Please check your code to ensure you're not making one of the following mistakes related to cryptography.

Writing your own home-grown cryptography primitives (For example: Mifare Classic)
- Exception: For the sake of learning, but don't deploy it in production.
Using a fast hash function (e.g. MD5, SHA256) for storing passwords. Use bcrypt instead.
Not using a cryptographically secure random number generator

Introduction to Functional Programming Johannes Weiß - https://vimeo.com/100786088
ReactiveCocoa at MobiDevDay Andrew Sardone - https://vimeo.com/65637501
The Future Of ReactiveCocoa Justin Spahr-Summers - https://www.youtube.com/watch?v=ICNjRS2X8WM
Enemy of the State Justin Spahr-Summers - https://www.youtube.com/watch?v=7AqXBuJOJkY
WWDC 2014 Session 229 - Advanced iOS Application Architecture and Patterns Andy Matuschak - https://developer.apple.com/videos/play/wwdc2014/229/
Functioning as a Functionalist Andy Matuschak - https://www.youtube.com/watch?v=rJosPrqBqrA
Controlling Complexity in Swift Andy Matuschak - https://realm.io/news/andy-matuschak-controlling-complexity/

	// Compile with clang -framework Foundation sethack.m

	#import <Foundation/Foundation.h>
	#import <objc/runtime.h>

	/*
	CFHashBytes from http://www.opensource.apple.com/source/CF/CF-1153.18/CFUtilities.c
	*/
	#define ELF_STEP(B) T1 = (H << 4) + B; T2 = T1 & 0xF0000000; if (T2) T1 ^= (T2 >> 24); T1 &= (~T2); H = T1;

	Intro
	Mindset, best practices, etc.
	The future of TV vs Mobile, different rates of innovation
	Apps: Media (Netflix, youtube, HBO, etc.) -> optimised for the apple tv
	Zoova, fitness
	Gilt shopping
	Games, disney infinity (like console gaming)
	Does not commute
	Alto adventure
	Madeira , digital comic book

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

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

	NSString *const PSPDFApplicationDidReceiveMemoryWarningNotification = @"PSPDFApplicationDidReceiveMemoryWarningNotification";

	// Test with sudo memory_pressure -l critical. Don't forget to re-set afterwards!
	__attribute__((constructor)) static void PSPDFInstallLowMemoryNotificationWarningMac(void) {
	static dispatch_source_t source;
	static dispatch_once_t onceToken;
	dispatch_once(&onceToken, ^{
	source = dispatch_source_create(DISPATCH_SOURCE_TYPE_MEMORYPRESSURE, 0, DISPATCH_MEMORYPRESSURE_WARN\|DISPATCH_MEMORYPRESSURE_CRITICAL, dispatch_get_main_queue());
	dispatch_source_set_event_handler(source, ^{
	dispatch_source_memorypressure_flags_t pressureLevel = dispatch_source_get_data(source);