pr changes made

Author: Alex Jamshidi

Sprint-3/2-practice-tdd/get-ordinal-number.js

@@ -1,13 +1,22 @@
 function getOrdinalNumber(num) {
-  if (!Number.isInteger(num) || num < 1) {throw new Error("Invalid number");}
-
-  let number = num.toString().slice(-2);
-  if (number == 11 || number == 12 || number == 13) {return `${num}th`;}
-  if (number.slice(-1) == 1) {return `${num}st`;}
-  if (number.slice(-1) == 2) {return `${num}nd`;}
-  if (number.slice(-1) == 3) {return `${num}rd`;}
-  else return `${num}th`;
+  if (!Number.isInteger(num) || num < 1) {
+    throw new Error("Invalid number");
+  }
 
+  const lastTwoDigits = num.toString().slice(-2);
+  const lastDigit = lastTwoDigits.slice(-1);
+  if (lastTwoDigits == 11 || lastTwoDigits == 12 || lastTwoDigits == 13) {
+    return `${num}th`;
+  }
+  if (lastDigit == 1) {
+    return `${num}st`;
+  }
+  if (lastDigit == 2) {
+    return `${num}nd`;
+  }
+  if (lastDigit == 3) {
+    return `${num}rd`;
+  } else return `${num}th`;
 }
 
 module.exports = getOrdinalNumber;