isNotEmpty

import samples.*
import kotlin.test.*
fun main() { 
   //sampleStart 
   val empty = emptyList<Any>()
assertFalse(empty.isNotEmpty())

val collection = listOf('a', 'b', 'c')
assertTrue(collection.isNotEmpty()) 
   //sampleEnd
}

import samples.*
import kotlin.test.*
import java.util.*
fun main() { 
   //sampleStart 
   fun totalValue(statisticsMap: Map<String, Int>): String =
    when {
        statisticsMap.isNotEmpty() -> {
            val total = statisticsMap.values.sum()
            "Total: [$total]"
        }
        else -> "<No values>"
    }

val emptyStats: Map<String, Int> = mapOf()
assertPrints(totalValue(emptyStats), "<No values>")

val stats: Map<String, Int> = mapOf("Store #1" to 1247, "Store #2" to 540)
assertPrints(totalValue(stats), "Total: [1787]") 
   //sampleEnd
}