Convert Number to Indonesian Words

number_to_words_id.kt

private const val TRILIUN = 1000000000000000
private const val MILIAR = 1000000000000
private const val JUTA = 1000000000

fun Long.toWords(): String {
    return when (this) {
        0L -> ""
        1L -> "Satu"
        2L -> "Dua"
        3L -> "Tiga"
        4L -> "Empat"
        5L -> "Lima"
        6L -> "Enam"
        7L -> "Tujuh"
        8L -> "Delapan"
        9L -> "Sembilan"
        10L -> "Sepuluh"
        11L -> "Sebelas"
        else -> {
            return when {
                this < 20 -> {
                    val first = (this - 10).toWords()
                    "$first Belas"
                }
                this < 100 -> {
                    val first = (this / 10).toWords()
                    val second = (this % 10).toWords()
                    "$first Puluh $second".trim()
                }
                this < 1000 -> {
                    val first = (this / 100)
                    val second = (this % 100).toWords()
                    return if (first == 1L) "Seratus $second".trim()
                    else "${first.toWords()} Ratus $second".trim()
                }
                this < 1000000 -> {
                    val first = (this / 1000).toWords()
                    val second = (this % 1000).toWords()
                    "$first Ribu $second".trim()
                }
                this < JUTA -> {
                    val first = (this / 1000000).toWords()
                    val second = (this % 1000000).toWords()
                    "$first Juta $second".trim()
                }
                this < MILIAR -> {
                    val first = (this / JUTA).toWords()
                    val second = (this % JUTA).toWords()
                    "$first Miliar $second".trim()
                }
                this < TRILIUN -> {
                    val first = (this / MILIAR).toWords()
                    val second = (this % MILIAR).toWords()
                    "$first Triliun $second".trim()
                }
                else -> {
                    ""
                }
            }
        }
    }
}

fun Number.toWords(): String {
    return toLong().toWords()
}