getOrNull

Returns a character at the given index or null if the index is out of bounds of this char sequence.

fun CharSequence.getOrNull(index: Int): Char?(source)

fun main() {
    val text = "Kotlin"

    // Get the character at index 2 (the third character)
    val charAt2 = text.getOrNull(2)   // 't'
    println("Character at index 2: $charAt2")

    // Try to get a character at an out‑of‑bounds index
    val charAt10 = text.getOrNull(10) // null
    println("Character at index 10: ${charAt10 ?: "Index out of bounds"}")
}

Source