implemented function

Author: bodoszidi

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

@@ -1,5 +1,18 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  if ( typeof num !==  "number" ){
+    throw new Error('Not a number')
+  }
+
+  if (num % 10 === 1 &&  num % 100 !== 11) {
+    return `${num}st`;
+  } else if (num % 10 === 2 && num % 100 !== 12 ) {
+    return `${num}nd`;
+  } else if (num % 10 === 3 && num % 100 !== 13) {
+    return `${num}rd`;
+  } else {
+   
+    return `${num}th`;
+  }
 }
 
 module.exports = getOrdinalNumber;