Swift Kotlin 数値 カンマ区切り

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swift

import UIKit

let formatter = NumberFormatter()
formatter.numberStyle = .decimal
let number = 1234567
let formattedNumber = formatter.string(from: NSNumber(value: number))
print(formattedNumber) // "1,234,567"

kotlin

import java.text.NumberFormat
import java.util.*

fun main() {
    val number = 1234567.89
    val nf = NumberFormat.getNumberInstance(Locale.getDefault())
    val formattedNumber = nf.format(number)
    println(formattedNumber)
}