@@ -8,7 +8,7 @@ const validateCreditNumber = (creditCardNumber) => {
     if (creditCardNumber.length !== 16){
       return `Invalid! The input ${creditCardNumber} should contains 16 characters!`;
     } else {
-      return 'success!';
+      return true;
     }
   }
 
@@ -27,7 +27,7 @@ const validateCreditNumber = (creditCardNumber) => {
     if (index.length !== 0){
       return `Invalid! The input ${creditCardNumber} should contains only numbers!`;
     } else {
-      return 'success!';
+      return true;
     }
 
   }
@@ -46,14 +46,14 @@ const validateCreditNumber = (creditCardNumber) => {
     if (index.length == 0){
       return `Invalid! The input ${creditCardNumber} should contains at least 2 different types of numbers!`;
     } else {
-      return 'success!';
+      return true;
     }
   }
 
   //The last number must be even
   function mustEven(creditCardNumber) {
     if (creditCardNumber[creditCardNumber.length-1] % 2 == 0) {
-      return 'success!';
+      return true;
     } else {
       return `Invalid! The last number must be even`;
     }
@@ -68,7 +68,7 @@ const validateCreditNumber = (creditCardNumber) => {
    if (sum < 16) {
      return `Invalid! The input ${creditCardNumber} should contains the numbers that must be greater than 16! `
    } else {
-     return 'success!';
+     return true;
    }
  }
 
@@ -82,7 +82,7 @@ const validateCreditNumber = (creditCardNumber) => {
   array.push(mustEven(creditCardNumber));
   array.push(sumOf(creditCardNumber));
   for (let i = 0 ; i < array.length ; i++) {
-    if (array[i] !== 'success!') {
+    if (array[i] !== true) {
       console.log(array[i]);
     } else {
       array2.push(array[i]);
Original file line number	Diff line number	Diff line change
`@@ -8,7 +8,7 @@ const validateCreditNumber = (creditCardNumber) => {`
`8`	`8`	`if (creditCardNumber.length !== 16){`
`9`	`9`	return `Invalid! The input ${creditCardNumber} should contains 16 characters!`;
`10`	`10`	`} else {`
`11`		`- return 'success!';`
	`11`	`+ return true;`
`12`	`12`	`}`
`13`	`13`	`}`
`14`	`14`
`@@ -27,7 +27,7 @@ const validateCreditNumber = (creditCardNumber) => {`
`27`	`27`	`if (index.length !== 0){`
`28`	`28`	return `Invalid! The input ${creditCardNumber} should contains only numbers!`;
`29`	`29`	`} else {`
`30`		`- return 'success!';`
	`30`	`+ return true;`
`31`	`31`	`}`
`32`	`32`
`33`	`33`	`}`
`@@ -46,14 +46,14 @@ const validateCreditNumber = (creditCardNumber) => {`
`46`	`46`	`if (index.length == 0){`
`47`	`47`	return `Invalid! The input ${creditCardNumber} should contains at least 2 different types of numbers!`;
`48`	`48`	`} else {`
`49`		`- return 'success!';`
	`49`	`+ return true;`
`50`	`50`	`}`
`51`	`51`	`}`
`52`	`52`
`53`	`53`	`//The last number must be even`
`54`	`54`	`function mustEven(creditCardNumber) {`
`55`	`55`	`if (creditCardNumber[creditCardNumber.length-1] % 2 == 0) {`
`56`		`- return 'success!';`
	`56`	`+ return true;`
`57`	`57`	`} else {`
`58`	`58`	return `Invalid! The last number must be even`;
`59`	`59`	`}`
`@@ -68,7 +68,7 @@ const validateCreditNumber = (creditCardNumber) => {`
`68`	`68`	`if (sum < 16) {`
`69`	`69`	return `Invalid! The input ${creditCardNumber} should contains the numbers that must be greater than 16! `
`70`	`70`	`} else {`
`71`		`- return 'success!';`
	`71`	`+ return true;`
`72`	`72`	`}`
`73`	`73`	`}`
`74`	`74`
`@@ -82,7 +82,7 @@ const validateCreditNumber = (creditCardNumber) => {`
`82`	`82`	`array.push(mustEven(creditCardNumber));`
`83`	`83`	`array.push(sumOf(creditCardNumber));`
`84`	`84`	`for (let i = 0 ; i < array.length ; i++) {`
`85`		`- if (array[i] !== 'success!') {`
	`85`	`+ if (array[i] !== true) {`
`86`	`86`	`console.log(array[i]);`
`87`	`87`	`} else {`
`88`	`88`	`array2.push(array[i]);`