🟢 Solve problem 136

Author: AF2B

swift/136.swift

@@ -0,0 +1,37 @@
+func singleNumber(_ nums: [Int]) -> Int {
+    var number = 0
+
+    for num in nums {
+        number ^= num
+    }
+
+    return number
+}
+
+func assertTrueInt(_ expectedValues: [Int], _ actualValues: [Int]) {
+    for i in 0..<expectedValues.count {
+        let expected = expectedValues[i]
+        let actual = actualValues[i]
+
+        if expected == actual {
+            print("Test case \(i) passed")
+        } else {
+            print("Test case \(i) failed")
+        }
+    }
+}
+
+var tests =
+    [
+        [2, 2, 1],
+        [4, 1, 2, 1, 2],
+    ]
+
+let expectedValues = [1, 4]
+var actualValues = [Int]()
+
+for i in 0..<tests.count {
+    actualValues.append(singleNumber(tests[i]))
+}
+
+assertTrueInt(expectedValues, actualValues)