Code to convert between array and set

Author: yadavan88

core-kotlin-modules/core-kotlin-collections-set/src/test/kotlin/com/baeldung/arraytoset/ArrayToSetUnitTest.kt

@@ -0,0 +1,37 @@
+package com.baeldung.arraytoset
+
+import org.junit.Test
+import kotlin.test.assertEquals
+
+class ArrayToSetUnitTest {
+    @Test
+    fun `convert array to set using toSet`() {
+        val arr = arrayOf(1, 5, 2, 4, 1)
+        val set = arr.toSet()
+        assertEquals(setOf(1, 5, 2, 4), set)
+    }
+
+    @Test
+    fun `convert array to set using setOf`() {
+        val arr = arrayOf(1, 5, 2, 4, 1)
+        val set = setOf(*arr)
+        assertEquals(setOf(1, 5, 2, 4), set)
+    }
+
+    @Test
+    fun `convert array to set using HashSet`() {
+        val arr = arrayOf(1, 5, 2, 4, 1)
+        val set = HashSet(arr.toList())
+        assertEquals(setOf(1, 5, 2, 4), set)
+    }
+
+    @Test
+    fun `convert array to set using loop`() {
+        val arr = arrayOf(1, 5, 2, 4, 1)
+        val mutableSet = mutableSetOf<Int>()
+        for (i in arr) {
+            mutableSet.add(i)
+        }
+        assertEquals(setOf(1, 5, 2, 4), mutableSet)
+    }
+}

core-kotlin-modules/core-kotlin-collections-set/src/test/kotlin/com/baeldung/settoarray/SetToArrayUnitTest.kt

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+package com.baeldung.settoarray
+
+import org.junit.Test
+import org.junit.jupiter.api.Assertions
+
+class SetToArrayUnitTest {
+
+    @Test
+    fun `convert set to array using toTypedArray`() {
+        val set = setOf(1, 2, 3, 4)
+        val arr = set.toTypedArray()
+        Assertions.assertArrayEquals(arrayOf(1, 2, 3, 4), arr)
+    }
+
+    @Test
+    fun `convert set to array using Array constructor`() {
+        val set = setOf(1, 2, 3, 4)
+        val arr = Array(set.size) { set.elementAt(it) }
+        Assertions.assertArrayEquals(arrayOf(1, 2, 3, 4), arr)
+    }
+}