get-ordinal-number : write implement ordinal logic for numbers ending in 1, 2, and 3, but excluding 11, 12, and 13 respectively

Author: AlanGit-debug2604

practice-tdd/get-ordinal-number.js

@@ -1,3 +1,16 @@
 export function getOrdinalNumber(num) {
-  return "1st";
+  //Given a number `num`, the function should return a string representing the ordinal form of that number.
+  //When the number ends with 1, except those ending with 11,
+  //Then the function should return a string by appending "st" to the number.
+  if (num % 10 === 1 && num % 100 !== 11) return `${num}st`;
+
+  //When the number ends with 2, except those ending with 12,
+  //Then the function should return a string by appending "nd" to the number.
+  if (num % 10 === 2 && num % 100 !== 12) return `${num}nd`;
+
+  //When the number ends with 3, except those ending with 13,
+  //Then the function should return a string by appending "rd" to the number.
+  if (num % 10 === 3 && num % 100 !== 13) return `${num}rd`;
+
+  return `${num}th`;
 }