minOfOrNull
inline fun CharSequence.minOfOrNull(
selector: (Char) -> Double
): Double?
inline fun CharSequence.minOfOrNull(
selector: (Char) -> Float
): Float?
inline fun <R : Comparable<R>> CharSequence.minOfOrNull(
selector: (Char) -> R
): R?
Returns the smallest value among all values produced by selector function
applied to each character in the char sequence or null
if there are no characters.