package jp.juggler.util

// same as x?.let{ dst.add(it) }
fun <T> T.addTo(dst: ArrayList<T>) = dst.add(this)

fun <E : List<*>> E?.notEmpty(): E? =
    if (this?.isNotEmpty() == true) this else null

fun <E : Map<*, *>> E?.notEmpty(): E? =
    if (this?.isNotEmpty() == true) this else null

fun ByteArray?.notEmpty(): ByteArray? =
    if (this?.isNotEmpty() == true) this else null