joinToString

fun ComplexFloatArray.joinToString(    separator: CharSequence = ", ",     prefix: CharSequence = "",     postfix: CharSequence = "",     limit: Int = -1,     truncated: CharSequence = "...",     transform: (ComplexFloat) -> CharSequence? = null): String
fun ComplexDoubleArray.joinToString(    separator: CharSequence = ", ",     prefix: CharSequence = "",     postfix: CharSequence = "",     limit: Int = -1,     truncated: CharSequence = "...",     transform: (ComplexDouble) -> CharSequence? = null): String

Creates a string from all the elements separated using separator and using the given prefix and postfix if supplied.

If the collection could be huge, you can specify a non-negative value of limit, in which case only the first limit elements will be appended, followed by the truncated string (which defaults to "...").