fix getOrdinalNumber function to handle invalid inputs and improve logic for ordinal suffixes

Author: alexandru-pocovnicu

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

@@ -1,10 +1,11 @@
 function getOrdinalNumber(num) {
+  if (typeof num !== "number" ||!Number.isInteger(num) || num === 0 ) {
+    return NaN;
+  }
+ 
   const lastDigit=Number(num.toString().slice(-1));
   const lastTwoDigits=Number(num.toString().slice(-2));
 
-  if(typeof num !=="number"){
-    return NaN;
-  }
 
   if(lastTwoDigits>=10 && lastTwoDigits<=13){
     return `${num}th`;
@@ -14,13 +15,13 @@ function getOrdinalNumber(num) {
     return `${num}st`;
   } else if (lastDigit === 2) {
     return `${num}nd`;
-  } else if (num === 3) {
-    return "3rd";
+  } else if (lastDigit === 3) {
+    return `${num}rd`;
   }
 
   return `${num}th`;
 
 }
-
+console.log(getOrdinalNumber(-1))
 module.exports = getOrdinalNumber;