Noah Tran NghiaTranUIT

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ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!

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The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

Don't use VPN services.

No, seriously, don't. You're probably reading this because you've asked what VPN service to use, and this is the answer.

Note: The content in this post does not apply to using VPN for their intended purpose; that is, as a virtual private (internal) network. It only applies to using it as a glorified proxy, which is what every third-party "VPN provider" does.

A Russian translation of this article can be found here, contributed by Timur Demin.
A Turkish translation can be found here, contributed by agyild.
There's also this article about VPN services, which is honestly better written (and has more cat pictures!) than my article.

Charles Proxy Map Remote over HTTP or HTTPS

The Map Remote tool changes the request location, per the configured mappings, so that the response is transparently served from the new location as if that was the original request.

HTTP

Using this feature for http resources does't require anything else apart from just configuring your Map Remote entry.

Always make sure you are clearing your cache before you test. Even if Charles is configured properly you might not see the changes unless the browser gets the resource again from the server and not for its local cache.

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?

	secret = "xxx"
	data = "http://someurl?someparams"
	hmac = OpenSSL::HMAC.digest(OpenSSL::Digest::Digest.new('sha1'), secret.encode("ASCII"), data.encode("ASCII"))
	signature = Base64.encode64(hmac).chomp

	// Paste in playground

	// Handy NSColor and String extensions

	import Cocoa


	extension String {
	func conformsTo(pattern: String) -> Bool {
	let pattern = NSPredicate(format:"SELF MATCHES %@", pattern)

	// Taken from the commercial iOS PDF framework http://pspdfkit.com.
	// Copyright (c) 2014 Peter Steinberger, PSPDFKit GmbH. All rights reserved.
	// Licensed under MIT (http://opensource.org/licenses/MIT)
	//
	// You should only use this in debug builds. It doesn't use private API, but I wouldn't ship it.

	#import <objc/runtime.h>
	#import <objc/message.h>
	#import <UIKit/UIKit.h>

	internal let DEFAULT_MIME_TYPE = "application/octet-stream"

	internal let mimeTypes = [
	"html": "text/html",
	"htm": "text/html",
	"shtml": "text/html",
	"css": "text/css",
	"xml": "text/xml",
	"gif": "image/gif",
	"jpeg": "image/jpeg",