Challenge 3: Lambdas with map and filter — Solution

fun main() {
    val numbers = listOf(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)

    val result = numbers
        .filter { it % 2 == 0 }
        .map { it * it }

    println(result)
}

/*
Output:
[4, 16, 36, 64, 100]

Notes:
- filter { it % 2 == 0 } keeps only even numbers: [2, 4, 6, 8, 10].
- map { it * it } squares each surviving element: [4, 16, 36, 64, 100].
- Both lambdas use the implicit "it" since each takes exactly one
  parameter — no need to name it explicitly.
- The two calls are chained directly (filter's result flows straight into
  map), which is the normal way to compose collection operators in Kotlin.
*/