is
Начиная с Kotlin: 1.0
inline fun <T> Array<out T>.isEmpty(): Boolean
inline fun ByteArray.isEmpty(): Boolean
inline fun ShortArray.isEmpty(): Boolean
inline fun IntArray.isEmpty(): Boolean
inline fun LongArray.isEmpty(): Boolean
inline fun FloatArray.isEmpty(): Boolean
inline fun DoubleArray.isEmpty(): Boolean
inline fun BooleanArray.isEmpty(): Boolean
inline fun CharArray.isEmpty(): Boolean
Возвращает true, если массив пуст.
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https://kotlinlang.org/api/core/kotlin-stdlib/kotlin.collections/is-empty.html
