Kotlin extension functions for sorting by locale(lang, country)

LocaleSortingExtensions.kt

// Example: cities.sortedWithLocaleBy(Locale("tr")) { it.name }
inline fun <T, R : Comparable<R>> Iterable<T>.sortedWithLocaleBy(
        locale: java.util.Locale,
        crossinline selector: (T) -> R?
) = sortedWith(compareBy(java.text.Collator.getInstance(locale), selector))

// Example: cities.sortedWithLocaleByDescending(Locale("tr")) { it.name }
inline fun <T, R : Comparable<R>> Iterable<T>.sortedWithLocaleByDescending(
        locale: java.util.Locale,
        crossinline selector: (T) -> R?
) = sortedWith(compareByDescending(java.text.Collator.getInstance(locale), selector))