Added comment to explain how the code runs

Author: Grajales-K

Sprint-3/revise/implement/card-validator.js

@@ -1,21 +1,26 @@
 function cardValidator(num) {
-  const numStr = num.toString(); // Convert to string for iteration
+  const numStr = num.toString(); // Convert to string for iteration with this we can check the length and individual checks
   if (numStr.length !== 16 || !/^[0-9]+$/.test(numStr) || numStr[numStr.length -1] % 2 === 1) {
+    console.log("I stopped because one of my condition is true")
     return false; // Check length is 16 numbers long, if it only contains digits and if the last digits is even
   }
 
-  let firstDigit = numStr[0]; // Track the first digit
+  let firstDigit = numStr[0]; // Track the first digit to compare with the rest digits
   for (let i = 1; i < numStr.length; i++) {
+  // console.log(`compare ${numStr[i]} con ${firstDigit} in position ${i}`);
+
     if (numStr[i] !== firstDigit) {
+      // console.log(`diferent digit found: ${numStr[i]}`);
       return true; // Found at least two different digits
     }
   }
-
+    // console.log("all digits are distint to same.");
+  console.log(`The last digit (${numStr[numStr.length - 1]}) is odd, so the validation fails.`);
   return false; // All digits are the same
 }
 
-console.log(cardValidator(1111111111111111)); // Output: false
-console.log(cardValidator(1234567890123456)); // Output: true
-console.log(cardValidator(2222222222222222)); // Output: false
-console.log(cardValidator(3333333333333334)); // Output: true
+console.log(cardValidator(1111111111111111)); // Output: false and stop in the first return.
+// console.log(cardValidator(1234567890123456)); // Output: true
+// console.log(cardValidator(2222222222222222)); // Output: false
+// console.log(cardValidator(3333333333333334)); // Output: true