kotlin-stdlib / kotlin.text / firstOrNull firstOrNull Common JVM JS Native 1.0 fun CharSequence.firstOrNull(): Char?(source) Returns the first character, or null if the char sequence is empty. Common JVM JS Native 1.0 inline fun CharSequence.firstOrNull( predicate: (Char) -> Boolean): Char?(source) Returns the first character matching the given predicate, or null if character was not found.