JuniorTheoryCommon

What does the program print?

KOTLIN

fun main() {
    val nums = listOf(1, 2, 3, 4, 5)
    println(nums.filter { it % 2 == 1 }.map { it * 10 })
}

[10, 30, 50]

Expecting [20, 40]: filter keeps the elements for which the condition is true, so it % 2 == 1 keeps the odd numbers.
Expecting each call in a chain to start from the original list: map works on what filter returned, and nums itself never changes.

What does the program print if the calls swap places, as map { it * 10 }.filter { it % 2 == 1 }?
What does println(nums) print after the chain, and why?

JuniorTheoryCommon

KOTLIN

fun main() {
    val nums = listOf(1, 2, 3, 4, 5)
    println(nums.filter { it % 2 == 1 }.map { it * 10 })
}

[10, 30, 50]

Expecting [20, 40]: filter keeps the elements for which the condition is true, so it % 2 == 1 keeps the odd numbers.
Expecting each call in a chain to start from the original list: map works on what filter returned, and nums itself never changes.

What does the program print if the calls swap places, as map { it * 10 }.filter { it % 2 == 1 }?
What does println(nums) print after the chain, and why?