Platform and version requirements: JS (1.0), Native (1.0)

fun append(c: Char): StringBuilder

fun append(csq: CharSequence?): StringBuilder

fun append(
    csq: CharSequence?, 
    start: Int, 
    end: Int
): StringBuilder

fun append(obj: Any?): StringBuilder

Platform and version requirements: Native (1.3)

fun append(it: CharArray): StringBuilder

fun append(it: String): StringBuilder

fun append(it: Boolean): StringBuilder

fun append(it: Byte): StringBuilder

fun append(it: Short): StringBuilder

fun append(it: Int): StringBuilder

fun append(it: Long): StringBuilder

fun append(it: Float): StringBuilder

fun append(it: Double): StringBuilder