forEach وrepeat وforEachIndexed

fun main() {
    val items = listOf("a", "b", "c")
    items.forEach { println(it) }
}

fun main() {
    val users = listOf("Alice", "Bob", "Charlie")
    users.forEach { name ->
        println("Hello, $name!")
    }
}

fun main() {
    repeat(5) {
        println("Iteration $it")
    }
}

fun main() {
    repeat(3) { println("-".repeat(20)) }
}

fun main() {
    val words = listOf("Hello", "Kotlin", "World")
    words.forEachIndexed { index, word ->
        println("$index: $word")
    }
}

fun main() {
    val nums = listOf(1, 2, 3, 4, 5)
    // forEach: runs to completion
    nums.forEach { print("$it ") }
    println()
    // for: can break
    for (n in nums) {
        if (n == 3) break
        print("$n ")
    }
    println()
}

fun main() {
    listOf(1, 2, 3, 4).forEach {
        if (it % 2 == 0) return@forEach // skip
        println("odd: $it")
    }
}

fun main() {
    val scores = mapOf("Alice" to 9, "Bob" to 7)
    scores.forEach { (name, score) ->
        println("$name -> $score")
    }
}

fun main() {
    var sum = 0
    repeat(10) { sum += it }
    println("Sum 0..9 = $sum") // 45
}

fun main() {
    val n = 1_000_000
    var sum = 0L
    for (i in 1..n) sum += i
    println(sum)
}