Day 1177 solved in swift

Author: WorkWithAfridi

.DS_Store

@@ -0,0 +1,27 @@
+// Given an array of integers where every integer occurs three times except for one integer,
+// which only occurs once, find and return the non-duplicated integer.
+
+// For example, given [6, 1, 3, 3, 3, 6, 6], return 1. Given [13, 19, 13, 13], return 19.
+
+func findSingleOccurrenceItem(myList: [Int]) -> Int? {
+    var occurrenceCountMap : [Int: Int] = [:]
+    myList.forEach { num in
+        occurrenceCountMap[num] = (occurrenceCountMap[num] ?? 0) + 1
+    }
+    for (key, value) in occurrenceCountMap {
+        if value == 1 {
+            return key
+        }
+    }
+    return nil
+}
+
+var givenList :[Int] = [6, 1, 3, 3, 3, 6, 6]
+
+var result : Int? = findSingleOccurrenceItem(myList: givenList)
+
+if result == nil {
+    print("No single occurrence item found")
+} else {
+    print("\(result!) is the single occurrence item in the list")
+}

Swift/.DS_Store

@@ -14,5 +14,6 @@
         <page name='BaseballGame'/>
         <page name='Day1093'/>
         <page name='Day1090'/>
+        <page name='Day1177'/>
     </pages>
 </playground>