Vadim Bulavin V8tr

## ios-questions-interview.md

      
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                V8tr
                / ios-questions-interview.md
            
            
              Created
              January 29, 2016 15:52
                — forked from arturlector/ios-questions-interview.md
            
              
                Вопросы на собеседование iOS разработчика.
              
          
    Вопросы на собеседование iOS разработчика (дополненное издание):

General:


Что такое полиморфизм?


Что такое *инкапсуляция? Что такое *нарушение инкапсуляции?


Чем абстрактный класс отличается от интерфейса?


Расскажите о паттерне MVC. Чем отличается пассивная модель от активной?


## JSONSerializable
//: Playground - noun: a place where people can play

import Foundation

protocol JSONSerializable {
	func toJSON() throws -> Any?
}

enum CouldNotSerializeError: Error {
	case noImplementation(source: Any, type: String)

## git_log_graph.txt
git log --graph --pretty=oneline --abbrev-commit

## cURL+Request.swift
extension URLRequest {

    /**
     Returns a cURL command representation of this URL request.
     */
    public var curlString: String {
        guard let url = url else { return "" }
        var baseCommand = "curl \(url.absoluteString)"

        if httpMethod == "HEAD" {

## AtomicInteger.swift
/// This is free and unencumbered software released into the public domain.
///
/// Anyone is free to copy, modify, publish, use, compile, sell, or
/// distribute this software, either in source code form or as a compiled
/// binary, for any purpose, commercial or non-commercial, and by any
/// means.
///
/// In jurisdictions that recognize copyright laws, the author or authors
/// of this software dedicate any and all copyright interest in the
/// software to the public domain. We make this dedication for the benefit

## queryFreeResourceUsage.json
{
    "usages": [
        {
            "additionalUsage": 0,
            "freeResourcGroups": [
                {
                    "groupId": "1002",
                    "groupName": "VOICE",
                    "resourceUnit": "102",
                    "resources": [

## AtomicPropertyWithDispatchAndOperationsQueues.swift
// MARK: - DispatchQueue

class DispatchQueueAtomicProperty {
    private let queue = DispatchQueue(label: "com.vadimbulavin.DispatchQueueAtomicProperty")
    private var underlyingFoo = 0

    var foo: Int {
        get {
            return queue.sync { underlyingFoo }
        }

## AtomicProperty.swift
import Foundation

// MARK: - Locks

protocol Lock {
    func lock()
    func unlock()
}

extension NSLock: Lock {}

## AverageBenchmark.swift
func averageBenchmark(iterations: Int, numberOfAttempts: Int, block: (Int) -> Void) -> TimeInterval {
    var accumulatedResult: TimeInterval = 0

    for _ in 0..<numberOfAttempts {
        let result = benchmark {
            for i in 0..<iterations {
                block(i)
            }
        }
        accumulatedResult += result

## RefactoringAppDelegate-Mediator.swift
// MARK: - AppLifecycleListener

protocol AppLifecycleListener {
    func onAppWillEnterForeground()
    func onAppDidEnterBackground()
    func onAppDidFinishLaunching()
}

// MARK: - Mediator
	//: Playground - noun: a place where people can play

	import Foundation

	protocol JSONSerializable {
	func toJSON() throws -> Any?
	}

	enum CouldNotSerializeError: Error {
	case noImplementation(source: Any, type: String)
	extension URLRequest {

	/**
	Returns a cURL command representation of this URL request.
	*/
	public var curlString: String {
	guard let url = url else { return "" }
	var baseCommand = "curl \(url.absoluteString)"

	if httpMethod == "HEAD" {
	/// This is free and unencumbered software released into the public domain.
	///
	/// Anyone is free to copy, modify, publish, use, compile, sell, or
	/// distribute this software, either in source code form or as a compiled
	/// binary, for any purpose, commercial or non-commercial, and by any
	/// means.
	///
	/// In jurisdictions that recognize copyright laws, the author or authors
	/// of this software dedicate any and all copyright interest in the
	/// software to the public domain. We make this dedication for the benefit
	{
	"usages": [
	{
	"additionalUsage": 0,
	"freeResourcGroups": [
	{
	"groupId": "1002",
	"groupName": "VOICE",
	"resourceUnit": "102",
	"resources": [
	// MARK: - DispatchQueue

	class DispatchQueueAtomicProperty {
	private let queue = DispatchQueue(label: "com.vadimbulavin.DispatchQueueAtomicProperty")
	private var underlyingFoo = 0

	var foo: Int {
	get {
	return queue.sync { underlyingFoo }
	}
	import Foundation

	// MARK: - Locks

	protocol Lock {
	func lock()
	func unlock()
	}

	extension NSLock: Lock {}
	func averageBenchmark(iterations: Int, numberOfAttempts: Int, block: (Int) -> Void) -> TimeInterval {
	var accumulatedResult: TimeInterval = 0

	for _ in 0..<numberOfAttempts {
	let result = benchmark {
	for i in 0..<iterations {
	block(i)
	}
	}
	accumulatedResult += result
	// MARK: - AppLifecycleListener

	protocol AppLifecycleListener {
	func onAppWillEnterForeground()
	func onAppDidEnterBackground()
	func onAppDidFinishLaunching()
	}

	// MARK: - Mediator