hasSurrogatePairAt

Returns true if this CharSequence has Unicode surrogate pair at the specified index.

fun CharSequence.hasSurrogatePairAt(index: Int): Boolean(source)

val emoji = "👍"          // U+1F44D is represented by a surrogate pair
val index = 0            // first code unit of the string
println(emoji.hasSurrogatePairAt(index))   // prints: true

Source