Co to są wyzwania programistyczne?
Małe programistyczne zadania, które wymagają zaimplementowania funkcji lub klasy w języku Kotlin. Dzięki temu możesz sprawdzić w praktyce czy poprawnie rozumiesz materiał z kursu i wyćwiczyć to tak, aby być w stanie używać nowych umiejętności od razu po warsztacie. Wszystkie wyzwania zostały zweryfikowane przez testy jednostkowe.
Przykładowe wyzwania
// Fibonacci number that starts from 1 and 1 (fib(0) == 1, fib(1) == 1, fib(2) == 2, fib(3) == 3, fib(4) == 5, fib(5) == 8)
// https://en.wikipedia.org/wiki/Fibonacci_number
fun fib(n: Int): Int = TODO()
fun main() {
fib(0) shouldEquals 1
fib(1) shouldEquals 1
fib(2) shouldEquals 2
fib(3) shouldEquals 3
fib(4) shouldEquals 5
fib(5) shouldEquals 8
fib(6) shouldEquals 13
fib(7) shouldEquals 21
fib(8) shouldEquals 34
fib(9) shouldEquals 55
fib(10) shouldEquals 89
}
infix fun <T> T.shouldEquals(other: T) {
if (this != other) throw AssertionError("Value $this not equal to $other")
}
interface Person {
val name: String
val age: Int
val canBuyAlcohol: Boolean
fun helloText(): String
fun cheerText(person: Person): String
}
// TODO: Implement classes Businessman and Student
// * They both should implement Person
// * They both can buy alcohol only if over 21
// * Businessman says hello by “Good morning”, Student by “Hi”.
// * Businessman cheers by “Hello, my name is {his name}, nice to see you {cheered person name}”, Student by “Hey {cheered person name}, I am {his name}”.
fun main() {
val businessman: Person = TODO("Use Businessman constructor here once it is implemented")
val student: Person = TODO("Use Businessman constructor here once it is implemented")
println(businessman.helloText())
println(student.helloText())
println(businessman.cheerText(student))
println(student.cheerText(businessman))
fun sayIfCanBuyAlcohol(person: Person) {
val modal = if(person.canBuyAlcohol) "can" else "can't"
println("${person.name} $modal buy alcohol")
}
sayIfCanBuyAlcohol(businessman)
sayIfCanBuyAlcohol(student)
}