// inclusive [1, 5]
val r1: IntRange = 1..5
// println("$r1: ${ r1.toList() }")

// exclusive [1, 5)
val r2 = 1 until 5
// println("$r2: ${ r2.toList() }")

// Odds in [1, 5]
val p1: IntProgression = 1..5 step 2
// println("$p1: ${ p1.toList() }")

// Reverse order
val p2 = 5 downTo 1
// println("$p2: ${ p2.toList() }")


// PRO TIP via in/!in

// compare: (5 >= 1) && (5 <= 5)
// println(5 in r1)

// compare !((5 >= 1) && (5 < 5))
// println(5 !in r2)


// PRO TIP with lists

// what are the valid indices?
// println(listOf(2, 5, 0, 0).indices)

// "slice": get a subset of a list
// println(listOf(2, 5, 0, 0).slice(1..2))


// Many other cool functions :)
// https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.ranges/-int-range/
// https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.ranges/-int-progression/

// how many?: .count()
// any values?: .isEmpty()
// add up: .sum()
// biggest/smallest: .min()/max()
// ABSTRACTIONS!!

fun countdown(start: Int) {
    fun excite(num: Int) {
        println("$num!")
    }

    (start downTo 1).forEach(::excite)
    println("Happy New Year!!")
}

// countdown(5)