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Using Obj-C with MacRuby/Rubymotion

This little post aims to help you to translate Objective-C Blocks into Ruby blocks. Let's start by taking a look at few examples of iOS API call where blocks are used for animations and enumeration

Ruby Lambda Syntaxes:

Im Rubymotion and MacRuby you can use all the Ruby Lambda syntaxes that are:

block = lambda { |param|  ... }

Avoid jQuery When Possible

jQuery does good jobs when you're dealing with browser compatibility. But we're living in an age that fewer and fewer people use old-school browsers such as IE <= 7. With the growing of DOM APIs in modern browsers (including IE 8), most functions that jQuery provides are built-in natively.

When targeting only modern browsers, it is better to avoid using jQuery's backward-compatible features. Instead, use the native DOM API, which will make your web page run much faster than you might think (native C / C++ implementaion v.s. JavaScript).

If you're making a web page for iOS (e.g. UIWebView), you should use native DOM APIs because mobile Safari is not that old-school web browser; it supports lots of native DOM APIs.

If you're making a Chrome Extension, you should always use native APIs, not only because Chrome has almost the latest DOM APIs available, but this can also avoid performance issue and unnecessary memory occupation (each jQuery-driven extension needs a separate

Animation

Tooltip

https://github.com/stevenbenner/jquery-powertip

	What is a Relational Database?
	------------------------------

	A set of true propositions
	Every row in a table is the statement about the truth related to the table
	Enforces logical integrity (business rules)
	Application independent store (this is the reason why relational database was created)

	Why Normalize?
	--------------

	Protocol
	------------

	Protocol in Objective-C is like interface in Java
	Apple tends to favor using subclasses than protocol
	NSObject is a class but also a protocol

	Category
	------------

	//
	// AppDelegate.m

	#import "AppDelegate.h"
	#import "GoogleOpenSource/GTMOAuth2Authentication.h"
	#import "MainViewController.h"
	#import "SignInViewController.h"

	@implementation AppDelegate

	// Inject a service into a controller (source: http://stackoverflow.com/a/14418384/477697)

	function MyCtrl($scope, $injector) {
	$scope.doSomething = function(someService) {
	var service = $injector.get(someService) // someService contains the name of a service
	service.value += 10
	}

	// Define a service (source: http://stackoverflow.com/a/15904939/477697)

	/*
	* Adapted from: http://code.google.com/p/gaequery/source/browse/trunk/src/static/scripts/jquery.autogrow-textarea.js
	*
	* Works nicely with the following styles:
	* textarea {
	* resize: none;
	* word-wrap: break-word;
	* transition: 0.05s;
	* -moz-transition: 0.05s;
	* -webkit-transition: 0.05s;

	/**
	* Slanted tabs with CSS 3D transforms
	* See http://lea.verou.me/2013/10/slanted-tabs-with-css-3d-transforms/
	*/

	body { padding: 50px; }

	nav {
	position: relative;
	z-index: 1;