implements CreditCardValidation

Author: serhatleventyavas

EasyValidationManager.xcodeproj/project.pbxproj

@@ -7,6 +7,7 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		045A9F5B24194CB700DDD1AC /* CreditCardValidation.swift in Sources */ = {isa = PBXBuildFile; fileRef = 045A9F5A24194CB700DDD1AC /* CreditCardValidation.swift */; };
 		0499107C240AADA70082E521 /* EasyValidationManager.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 04991072240AADA70082E521 /* EasyValidationManager.framework */; };
 		04991081240AADA70082E521 /* EasyValidationManagerTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 04991080240AADA70082E521 /* EasyValidationManagerTests.swift */; };
 		04991083240AADA70082E521 /* EasyValidationManager.h in Headers */ = {isa = PBXBuildFile; fileRef = 04991075240AADA70082E521 /* EasyValidationManager.h */; settings = {ATTRIBUTES = (Public, ); }; };
@@ -33,6 +34,7 @@
 /* End PBXContainerItemProxy section */
 
 /* Begin PBXFileReference section */
+		045A9F5A24194CB700DDD1AC /* CreditCardValidation.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CreditCardValidation.swift; sourceTree = "<group>"; };
 		04991072240AADA70082E521 /* EasyValidationManager.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = EasyValidationManager.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		04991075240AADA70082E521 /* EasyValidationManager.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = EasyValidationManager.h; sourceTree = "<group>"; };
 		04991076240AADA70082E521 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
@@ -147,6 +149,7 @@
 			isa = PBXGroup;
 			children = (
 				049910A8240AAEFD0082E521 /* PhoneValidation.swift */,
+				045A9F5A24194CB700DDD1AC /* CreditCardValidation.swift */,
 			);
 			path = Validations;
 			sourceTree = "<group>";
@@ -302,6 +305,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				049910A6240AAEE50082E521 /* Country.swift in Sources */,
+				045A9F5B24194CB700DDD1AC /* CreditCardValidation.swift in Sources */,
 				049910A9240AAEFD0082E521 /* PhoneValidation.swift in Sources */,
 				049910AE240AAF2B0082E521 /* JsonParser.swift in Sources */,
 			);

EasyValidationManager.xcodeproj/project.xcworkspace/xcuserdata/mac.xcuserdatad/UserInterfaceState.xcuserstate

@@ -0,0 +1,51 @@
+import Foundation
+
+public class CreditCardValidation {
+    
+    private init() {}
+    
+    public static func validCreditCard(cardNumber: String) -> Bool {
+        if cardNumber.trimmingCharacters(in: .whitespacesAndNewlines).count != 16 {
+            return false
+        }
+        
+        let cardNumberArray = Array(cardNumber)
+        var numberList: [Int] = []
+        
+        let lastDigit: Int = Int(String(cardNumberArray[cardNumberArray.count - 1]))!
+        
+        for index in 0...cardNumberArray.count - 2 {
+            let number: Int = Int(String(cardNumberArray[index]))!
+            numberList.append(number)
+        }
+        
+        numberList.reverse()
+        
+        for index in 0..<numberList.count {
+            if (index % 2 == 0) {
+                let number = numberList[index]
+                numberList[index] = number * 2
+            }
+        }
+        
+        for index in 0..<numberList.count {
+            if (index % 2 == 0) {
+                let number = numberList[index]
+                if (number > 9) {
+                    numberList[index] = number - 9
+                }
+            }
+        }
+        
+        var totalSum = 0
+        
+        for index in 0..<numberList.count {
+            let number = numberList[index]
+            totalSum += number
+        }
+        
+        let resultOfMod10 = (totalSum + lastDigit) % 10
+        return resultOfMod10 == 0
+    }
+    
+}

EasyValidationManager/Validations/CreditCardValidation.swift

@@ -54,4 +54,19 @@ class EasyValidationManagerTests: XCTestCase {
         let result: Bool = PhoneValidation.validPhoneNumber(country: country, phoneNumber: "5551231233")
         XCTAssertEqual(result, true)
     }
+    
+    func test_givenCreditWrongCreditCard_returnFalse() {
+        let result: Bool = CreditCardValidation.validCreditCard(cardNumber: "4532030566401450")
+        XCTAssertEqual(result, false)
+    }
+    
+    func test_givenCreditCorrectCreditCard_returnTrue() {
+        let result: Bool = CreditCardValidation.validCreditCard(cardNumber: "4556737586899855")
+        XCTAssertEqual(result, true)
+    }
+    
+    func test_givenCreditAnotherCorrectCreditCard_returnTrue() {
+        let result: Bool = CreditCardValidation.validCreditCard(cardNumber: "4175001382805488")
+        XCTAssertEqual(result, true)
+    }
 }