public class Person {

    private final String firstName;
    private final String lastName;
    private final LocalDate birthDay;

    public Person(String firstName, String lastName, 
                  LocalDate birthDay) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.birthDay = birthDay;
    }

    public String getFirstName() {
        return firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public LocalDate getBirthDay() {
        return birthDay;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Person person = (Person) o;
        return Objects.equals(firstName, person.firstName) &&
                Objects.equals(lastName, person.lastName) &&
                Objects.equals(birthDay, person.birthDay);
    }

    @Override
    public int hashCode() {
        return Objects.hash(firstName, lastName, birthDay);
    }

    @Override
    public String toString() {
        return "Person{" +
                "firstName='" + firstName + '\'' +
                ", lastName='" + lastName + '\'' +
                ", birthDay=" + birthDay +
                '}';
    }
}

data class PersonK(
    val firstName: String,
    val lastName: String,
    val birthDay: LocalDate
)

Rectangle()

class GameField :

val lazyValue: String by lazy {
    println("computed!")
    "Hello Kotliners"
}

println(lazyValue)
println(lazyValue)

var name by CountAccess()

class CountAccess {

    operator fun getValue(thisRef: Any?, property: KProperty<*>): String {
        return "Do you need help?"
    }

    operator fun setValue(thisRef: Any?, property: KProperty<*>, value: String) {
        println("Hallo my name is $value... and I will help you'")
    }
}

name = "Hannibal"
name = "Murdock"
name = "Face"
println(name)

suspend fun checkPosition(): Position {
    delay(1000)
    println("🔍 Checked Position")
    return Position()
}

suspend fun getWeather(): Weather {
    delay(1000)
    println("☀ Checked Weather")
    return Weather()
}

suspend fun playForecast() {
    delay(1000)
    println("🔊 Play Forecast")
}

val fibonacci = sequence {

    yield(1) // first Fibonacci number

    var current = 1
    var next = 1

    while (true) {

        yield(next) // next Fibonacci number

        val tmp = current + next
        current = next
        next = tmp
    }

}

println(fibonacci.take(42).joinToString())

1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181, 6765, 10946, 17711, 28657, 46368, 75025, 121393, 196418, 317811, 514229, 832040, 1346269, 2178309, 3524578, 5702887, 9227465, 14930352, 24157817, 39088169, 63245986, 102334155, 165580141, 267914296

fun loopWithThreads() {
    val c = AtomicLong()
    println("🦙🦙🦙🦙🦙🦙🦙🦙🦙🦙")

    measureTime {
        for (i in 1..100_000) {
            thread(start = true) {
                c.addAndGet(1).printProgress()
            }
        }
    }
}

fun loopWithCoroutine() {
    val c = AtomicLong()
    println("🦙🦙🦙🦙🦙🦙🦙🦙🦙🦙")

    measureTime {
        for (i in 1..100_000) {
            GlobalScope.launch {
                c.addAndGet(1).printProgress()
            }
        }
    }
}

fun loopWithThreads() {
    val c = AtomicLong()
    println("🦙🦙🦙🦙🦙🦙🦙🦙🦙🦙")

    measureTime {
        for (i in 1..loopCount) {
            thread(start = true) {
                c.addAndGet(1).printProgress()
            }
        }
    }
}

fun loopWithCoroutine() {
    val c = AtomicLong()
    println("🦙🦙🦙🦙🦙🦙🦙🦙🦙🦙")

    measureTime {
        for (i in 1..loopCount) {
            GlobalScope.launch {
                c.addAndGet(1).printProgress()
            }
        }
    }
}

🦙🦙🦙🦙🦙🦙🦙🦙🦙🦙
🥩🥩🥩🥩🥩🥩🥩🥩🥩🥩
time: 0m 5s 363ms

🦙🦙🦙🦙🦙🦙🦙🦙🦙🦙
🥩🥩🥩🥩🥩🥩🥩🥩🥩🥩
time: 0m 0s 145ms

@RestController
class HelloController {

    @GetMapping("/hello")
    fun handle() = "Hello WebFlux"
}