isEmpty
 Platform and version requirements: JVM (1.0), JS (1.1), Native (1.3) 
open fun isEmpty(): Boolean
Checks whether the range is empty.
    © 2010–2020 JetBrains s.r.o. and Kotlin Programming Language contributors
Licensed under the Apache License, Version 2.0.
    https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.ranges/-closed-range/is-empty.html