Add isNullOrEmpty() to Array, Collection, and Map. Fixes KT-23279

libraries/stdlib/samples/test/samples/collections/arrays.kt

@@ -32,6 +32,18 @@ class Arrays {
             val array: Array<Char>? = arrayOf('a', 'b', 'c')
             assertPrints(array.orEmpty().contentToString(), "[a, b, c]")
         }
+
+        @Sample
+        fun arrayIsNullOrEmpty() {
+            val nullArray: Array<Any>? = null
+            assertTrue(nullArray.isNullOrEmpty())
+
+            val emptyArray = emptyArray<Any>()
+            assertTrue(emptyArray.isNullOrEmpty())
+
+            val array = arrayOf('a', 'b', 'c')
+            assertFalse(array.isNullOrEmpty())
+        }
     }
 
     class Transformations {

libraries/stdlib/samples/test/samples/collections/collections.kt

@@ -53,13 +53,13 @@ class Collections {
 
         @Sample
         fun collectionIsNullOrEmpty() {
-            val nullCollection: Collection<Any>? = null
-            assertTrue(nullCollection.isNullOrEmpty())
+            val nullList: List<Any>? = null
+            assertTrue(nullList.isNullOrEmpty())
 
-            val emptyCollection: Collection<Any>? = listOf()
-            assertTrue(emptyCollection.isNullOrEmpty())
+            val empty: List<Any>? = emptyList<Any>()
+            assertTrue(empty.isNullOrEmpty())
 
-            val collection: Collection<Char>? = listOf('a', 'b', 'c')
+            val collection: List<Char>? = listOf('a', 'b', 'c')
             assertFalse(collection.isNullOrEmpty())
         }