範囲とコレクションを反復するforループ

fun main() {
    for (i in 1..5) {
        println(i)
    }
    // 1, 2, 3, 4, 5
}

fun main() {
    for (i in 0 until 4) {
        println("Index: $i")
    }
    // 0, 1, 2, 3
}

fun main() {
    for (i in 10 downTo 1) {
        print("$i ")
    }
    println() // 10 9 8 7 6 5 4 3 2 1
}

fun main() {
    for (i in 0..20 step 5) {
        print("$i ")
    }
    println() // 0 5 10 15 20
}

fun main() {
    val fruits = listOf("apple", "banana", "cherry")
    for (fruit in fruits) {
        println(fruit)
    }
}

fun main() {
    val items = listOf("a", "b", "c")
    for (i in items.indices) {
        println("$i: ${items[i]}")
    }
    for ((idx, v) in items.withIndex()) {
        println("idx=$idx v=$v")
    }
}

fun main() {
    val scores = mapOf("Alice" to 92, "Bob" to 78)
    for ((name, score) in scores) {
        println("$name: $score")
    }
}

fun main() {
    for (c in "Kotlin") {
        print("$c ")
    }
    println() // K o t l i n
}

fun main() {
    for (row in 1..3) {
        for (col in 1..3) {
            print("($row,$col) ")
        }
        println()
    }
}

fun main() {
    for (c in 'A'..'E') {
        print("$c ")
    }
    println() // A B C D E
}