Kotlin Basics

What is the output of the following code?

fun main() {
val list = listOf(1, 2, 3)
val doubledList = list.map { it * 2 }
println(doubledList)
}

What is the output of the following code?

fun main() {
val nullableString: String? = null
val length = nullableString?.length ?: -1
println(length)
}

What is the output of the following code?

fun main() {
val numbers = mutableListOf(1, 2, 3, 4, 5)
numbers.removeIf { it % 2 == 0 }
println(numbers)
}

What is the output of the following code?

fun main() {
val x: Int? = null
val y = 5
println(x ?: y)
}

What is the output of the following code?

fun main() {
val numbers = listOf(1, 2, 3, 4, 5)
val filteredNumbers = numbers.filter { it % 2 == 0 }
println(filteredNumbers)
}