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let bear = Array("bear")
let bird = Array("bird")
let diff = bird.difference(from: bear)
let newBird = bear.applying(diff)
print(diff)
print(newBird)

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func parsingDates() {
    let date = Date.now

    let format = Date.FormatStyle().year().day().month()
    let formatted = date.formatted(format) //  "Jun 7, 2021"

    if let date = try? Date(formatted, strategy: format) {

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// https://developer.apple.com/videos/play/wwdc2022/110357 

import RegexBuilder

func ~=<T>(pattern :Regex<T> , value:  String) -> Bool {
    do {
        return try pattern.firstMatch(in: value) != nil
    } catch {
        return false
    }

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I am developing for iOS and RoR. For date time issue, I feel lucky, since both works with ISO 8601. 

By default, Rails 4 returns ISO 8601 format as json output.

On iOS, you should have date format as @"yyyy-MM-dd'T'HH:mm:ssZZZ"



See http://developer.github.com/v3/ (search "ISO")

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Customizing a model object's JSON representation, first of all, is a business of ActiveRecord::Serialization. You will look at ActiveModel::Serializers::JSON class


https://github.com/rails/rails/blob/master/activemodel/lib/active_model/serializers/json.rb

and then will come back to ActiveModel::Serialization class

https://github.com/rails/rails/blob/master/activemodel/lib/active_model/serialization.rb

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Do you know, you can access your own rails website on /rails/info/routes , under development environment?

The working house is shown below.

https://github.com/rails/rails/blob/master/railties/lib/rails/info_controller.rb

In turn, ActionDispatch::Routing::RoutesInspector is the real hero. Linked below.

https://github.com/rails/rails/blob/master/actionpack/lib/action_dispatch/routing/inspector.rb

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UIStory needs a Procedure to guide it, and story listens to Procedure's events of proceed and complete .
It is UIStory to expose proceedNext method for client to call. While UI will have "next" button to proceed the procedure, too.  

UIStory has a JXUIVCFactory_ProcedureStep .

VCFactory will createVC, setObject:intoVC, and getObject:fromVC, according to step.

Since the kinds of steps are currently limited, the VC types to be used are limited too, therefore manually manageable. 

JXModel_ProcedureStep_ObjectPart_Attribute --- JXUITVDSD_NSArray_Selection (or JXUITVDSD_NSArray_Selection__allowsAddSimpleTextOptions)

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## Filtering

NSPredicate


## Ordering/Sorting

NSSortDescriptor

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Controller 和 Filter 互联方案

以ControllerContext为中介，合理利用ViewData。

http://msdn.microsoft.com/en-us/library/system.web.mvc.controllercontext(v=vs.108).aspx


自定义Model类：

UserIntention

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class_addIvar, in Objective-C runtime, is useless, because it does not support to add ivar in an EXISTING class.

https://developer.apple.com/library/ios/documentation/Cocoa/Reference/ObjCRuntimeRef/Reference/reference.html#//apple_ref/c/func/class_addIvar

You can use the concept of idInfo (see id-ego-superego), to add run-time generated objects' property.