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(function() {
    var feelGood = {
        talktoomuch: "I'm good at programming."
    };

    var feelBetter = {
        arrogant: Infinity
    };

    var feelBest = function() {

tonnylitao

//some time, frc section may be need section offset
@objc public protocol MFetchedResultsControllerOffsetSectionDelegate{
    func offsetSection() -> Int
}

class MFetchedResultsController: NSFetchedResultsController, NSFetchedResultsControllerDelegate {
    weak var viewController: UIViewController?  //UITableViewController UICollectionViewController
    weak var scrollView: UIScrollView?          //TableView CollectionView
    
    weak var offsetSectionDelegate: MFetchedResultsControllerOffsetSectionDelegate?

tonnylitao

numCommonFriends x y = do 
  fx <- friendsOf x   --database query, automatically work concurrently
  fy <- friendsOf y   --database query, automatically work concurrently
  return (length (intersect fx fy))

-- NodeJS, Go, GCD, Java...other languages need extra code for concurrency,

tonnylitao

import Foundation
import UIKit

protocol Dao {}
extension NSObject: Dao {}

extension Dao where Self : NSObject {
    
    typealias ConfigClosure = (Self) -> Void
    

tonnylitao

#Android MVP

##1. Using MVP Android Activity in old time was God Entity which contained tons of business logic. But in MVP architecture, activity is just activity, it’s a native part managed by system. We strive not to disturb activity in business logic development by putting logic/io/computing… code into Presenter.

class HomeActivity extends AppCompatActivity {
    private HomeActivityPresenter mPresenter;
    //...

tonnylitao

import UIKit

// KeyboardAvoidable
// original by Roy McKenzie

protocol KeyboardShowAndHideProtocol: class {
    typealias KeyboardHeightDuration = (height: CGFloat, duration: Double)
    typealias KeyboardHeightDurationBlock = (KeyboardHeightDuration) -> Void

    

tonnylitao

do {
    try audioPlayer = AVAudioPlayer(contentsOf: url)
    audioPlayer.isMeteringEnabled = true
    audioPlayer.enableRate = true
    audioPlayer.prepareToPlay()
} catch let error as NSError {
    print("audioPlayer error \(error.localizedDescription)")
}

audioPlayer.play()

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import androidx.lifecycle.ViewModel
import androidx.lifecycle.ViewModelProvider
import kotlin.reflect.full.primaryConstructor

class AndroidViewModelFactory(private vararg val args: Any) :
    ViewModelProvider.NewInstanceFactory() {

    override fun <T : ViewModel> create(modelClass: Class<T>) =
        modelClass.kotlin.primaryConstructor?.call(*args)
            ?: throw IllegalArgumentException("$modelClass primaryConstructor is null")

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class IntViewModelFactory(val application: Application, val int: Int) :
    ViewModelProvider.NewInstanceFactory() {

    @Suppress("UNCHECKED_CAST")
    override fun <T : ViewModel?> create(modelClass: Class<T>) =
        IntViewModel(application, int) as T
}

class StringViewModelFactory(val application: Application, val string: String) :
    ViewModelProvider.NewInstanceFactory() {

tonnylitao

import androidx.recyclerview.widget.DiffUtil

interface RecyclerItem {
 val layoutId: Int

 val variableId: Int
 val dataToBind: Any

 val id: Int