Puzzlers are tricky programming challenges with often surprising answers. They show how bad practices can lead to problems.
Order of nullable operators
EN
PL fun main() {
val x: Int? = 2
val y: Int = 3
val sum = x?:0 + y
println(sum)
}
a) 3
b) 5
c) 2
d) 0
Extensions are resolved statically
open class C
class D: C()
fun C.foo() = "c"
fun D.foo() = "d"
fun printFoo(c: C) {
println(c.foo())
}
fun main() {
printFoo(D())
}
a) Doesn't compile
b) Runtime error
c) "c"
d) "d"
"On this workshop, I not only systematized knowledge about Kotlin syntax but also, thanks to Marcin, I changed my way of thinking about problem-solving to functional way - I got a new tool that I can use at work on a daily basis. It seems to me that whole training is focused on immediate use of new knowledge in daily work. Big +"
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