10 вопросов руководителю мобильной разработки «Лаборатории Касперского»: «Не надо сразу бросаться строить подводную лодку»

getSupportFragmentManager()
	.beginTransaction()
	.add(R.id.activity_main_frame, messageFragment)
	.add(R.id.activity_main_frame, messageFragment2)
	.add(R.id.activity_main_frame, messageFragment3)
	.show(messageFragment2)
	.commit();

Observable.range(0, Integer.MAX_VALUE - 1)
	.take(10)
	// something else
	.subscribe();

public interface Request {
    // некоторый контент
};
 
public interface Producer {
    // возвращает null, если объект stopSignal указывает на необходимость остановки,
    // либо новый запрос в противном случае
      Request GetRequest(Stopper stopSignal);
}
public interface Consumer {
    // обрабатывает запрос, завершает обработку досрочно, если
    // объект stopSignal указывает на необходимость остановки
    void ProcessRequest(Request request, Stopper stopSignal);
}

fun main(args: Array<String>) {
    val list = ArrayList<String>()
    list.add("hello")
    list.add("habr")
    list.forEach {
        if (it.length < 5) return
        print(it)
    }
    print("end")
}

final class User: NSObject {           
   @objc var nickname = "Foo"        
}
       
func main() {
   let user = User()
           
   let observer = user.observe(\User.nickname) { user, _ in
      print("nickname: \(user.nickname)")
   }
   user.nickname += "Bar"
   observer.invalidate()
}

func closureTask() {
           
        func first() {
            	print("----- first -----")
               
                var num = 42
            	var str = "foo"
            	var arr = [1]
               
                let closure = {
                	print("num: \(num)")
                	print("str: \(str)")
                	print("arr: \(arr)")
            	}
               
                num = 10
            	str = "bar"
            	arr = [1, 2]
               
                closure()
        }
           
        func second() {
            	print("----- second -----")
               
                var num = 42
            	var str = "foo" as NSMutableString
            	var arr = [1] as NSMutableArray
               
                let closure = { [num, str, arr] in
                	print("num: \(num)")
                	print("str: \(str)")
                	print("arr: \(arr)")
            	}
               
                num = 10
            	str = "bar"
            	arr = [1, 2] as NSMutableArray
               
                closure()
        }
           
        func third() {
            	print("----- third -----")
               
                var num = 42
            	var str = "foo" as NSMutableString
            	var arr = [1] as NSMutableArray
               
                let closure = { [num, str, arr] in
                	print("num: \(num)")
                	print("str: \(str)")
                	print("arr: \(arr)")
            	}
               
                num += 10
	        str.append("bar")
            	arr.add(2)
               
                closure()
        }
           
        first()
        second()
        third()
           
}
       
func main() {
        closureTask()
}

func main() {
        let foundationString = "abcdefg_123456"
        let part1String = String(foundationString.split(separator: "_")[0])
        let part2String = String(foundationString.split(separator: "_")[1])
           
        let cPart1 = part1String.utf8CString.reversed()
        let cPart2 = part2String.utf8CString.reversed()
        let cString = Array(cPart1) + Array(cPart2)
        let representationPointer = cString.withUnsafeBufferPointer { $0 }
           
        let reversedFoundationString = String(cString: representationPointer.baseAddress!)
           
        print(contains(character: stringToChar("1"), inCString: representationPointer))
        print(contains(character: 0, inCString: representationPointer))
        print(reversedFoundationString.contains("1"))
        print(reversedFoundationString.contains(Character.init(Unicode.Scalar(0))))
        print(representationPointer.count == foundationString.count)
}
       
func stringToChar(_ string: String) -> Int8 {
        return string.utf8CString.first!
}
       
func contains(character: Int8, inCString cString: UnsafeBufferPointer<Int8>) -> Bool {
        let length = cString.count
        let stringBaseAddress = cString.baseAddress!
        guard length != 0 else {
            	return false
        }
           
        for i in 0..<length {
            	if stringBaseAddress.advanced(by: i).pointee == character {
                	return true
            	}
        }
        return false
}

func resolve(input: String) -> [String] {
        //Enter your code here
}