Ronan Rodrigo Nunes ronanrodrigo

If you're writing web applications with Ruby there comes a time when you might need something a lot simpler, or even faster, than Ruby on Rails or the Sinatra micro-framework. Enter Rack.

Rack describes itself as follows:

Rack provides a minimal interface between webservers supporting Ruby and Ruby frameworks.

Before Rack came along Ruby web frameworks all implemented their own interfaces, which made it incredibly difficult to write web servers for them, or to share code between two different frameworks. Now almost all Ruby web frameworks implement Rack, including Rails and Sinatra, meaning that these applications can now behave in a similar fashion to one another.

At it's core Rack provides a great set of tools to allow you to build the most simple web application or interface you can. Rack applications can be written in a single line of code. But we're getting ahead of ourselves a bit.

Following the tradition from last year, here's my complete list of all interesting features and updates I could find in Apple's OSes, SDKs and developer tools that were announced at this year's WWDC. This is based on the keynotes, the "What's New In ..." presentations and some others, Apple's release notes, and blog posts and tweets that I came across in the last few weeks.

If for some reason you haven't watched the talks yet, I really recommend watching at least the "State of the Union" and the "What's New In" intros for the platforms you're interested in. The unofficial WWDC Mac app is great way to download the videos and keep track of what you've already watched.

If you're interested, here are my WWDC 2015 notes (might be useful if you're planning to drop support for iOS 8 now and start using some iOS 9 APIs).

OSX → macOS 10.12 Sierra

JQ to filter JSON by value

Syntax: cat <filename> | jq -c '.[] | select( .<key> | contains("<value>"))'

Example: To get json record having _id equal 611

cat my.json | jq -c '.[] | select( ._id | contains(611))'

Remember: if JSON value has no double quotes (eg. for numeric) to do not supply in filter i.e. in contains(611)

FWIW: I (@rondy) am not the creator of the content shared here, which is an excerpt from Edmond Lau's book. I simply copied and pasted it from another location and saved it as a personal note, before it gained popularity on news.ycombinator.com. Unfortunately, I cannot recall the exact origin of the original source, nor was I able to find the author's name, so I am can't provide the appropriate credits.

Effective Engineer - Notes

By Edmond Lau
Highly Recommended 👍
http://www.theeffectiveengineer.com/

	ACTION
	AD_HOC_CODE_SIGNING_ALLOWED
	ALTERNATE_GROUP
	ALTERNATE_MODE
	ALTERNATE_OWNER
	ALWAYS_SEARCH_USER_PATHS
	ALWAYS_USE_SEPARATE_HEADERMAPS
	APPLE_INTERNAL_DEVELOPER_DIR
	APPLE_INTERNAL_DIR
	APPLE_INTERNAL_DOCUMENTATION_DIR

	http://devstreaming.apple.com/videos/wwdc/2014/403xxksrj0qs8c0/403/403_hd_intermediate_swift.mov?dl=1
	http://devstreaming.apple.com/videos/wwdc/2014/403xxksrj0qs8c0/403/403_sd_intermediate_swift.mov?dl=1
	http://devstreaming.apple.com/videos/wwdc/2014/403xxksrj0qs8c0/403/403_intermediate_swift.pdf?dl=1
	http://devstreaming.apple.com/videos/wwdc/2014/419xxli6f60a6bs/419/419_hd_advanced_graphics_and_animation_performance.mov?dl=1
	http://devstreaming.apple.com/videos/wwdc/2014/419xxli6f60a6bs/419/419_sd_advanced_graphics_and_animation_performance.mov?dl=1
	http://devstreaming.apple.com/videos/wwdc/2014/419xxli6f60a6bs/419/419_advanced_graphics_and_animation_performance.pdf?dl=1
	http://devstreaming.apple.com/videos/wwdc/2014/101xx36lr6smzjo/101/101_hd.mov?dl=1
	http://devstreaming.apple.com/videos/wwdc/2014/101xx36lr6smzjo/101/101_sd.mov?dl=1
	http://devstreaming.apple.com/videos/wwdc/2014/236xxwk3fv82sx2/236/236_hd_building_interruptible_and_responsive_interactions.mov?dl=1
	http://devstreaming.apple.com/videos/wwdc/2

	<?xml version="1.0" encoding="UTF-8"?>
	<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
	<plist version="1.0">
	<dict>
	<key>ANSIBlackColor</key>
	<data>
	YnBsaXN0MDDUAQIDBAUGFRZYJHZlcnNpb25YJG9iamVjdHNZJGFyY2hpdmVyVCR0b3AS
	AAGGoKMHCA9VJG51bGzTCQoLDA0OVU5TUkdCXE5TQ29sb3JTcGFjZVYkY2xhc3NPECcw
	LjE0NTA5ODAzOTIgMC4xNDkwMTk2MDc4IDAuMTg4MjM1Mjk0MQAQAYAC0hAREhNaJGNs
	YXNzbmFtZVgkY2xhc3Nlc1dOU0NvbG9yohIUWE5TT2JqZWN0XxAPTlNLZXllZEFyY2hp

	//Function to pretty-print Json Object in Swift 3
	func prettyPrint(with json: [String:Any]) -> String{
	let data = try! JSONSerialization.data(withJSONObject: json, options: .prettyPrinted)
	let string = NSString(data: data, encoding: String.Encoding.utf8.rawValue)
	return string as! String
	}

	Banco do Brasil = "bbapp://"
	Bradesco = "BDNiPhoneVarejo://"
	Bradesco Prime = "BDNiPhonePrime://"
	Itaú = "itauvarejo://"
	Itaú Personnalité = "itaupersonnalite://"
	Santander = "santanderpf://"
	Sicoob = "sicoob://"
	Neon = "banconeon://"
	Nubank = "nuapp://"

Ronan Rodrigo Nunes ronanrodrigo

OSX → macOS 10.12 Sierra

JQ to filter JSON by value

Effective Engineer - Notes

What's an Effective Engineer?