implemented and wrote test cases for getOrdinalNumber function

Author: marthak1

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

@@ -1,5 +1,23 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  const lastTwoDigits = num % 100;
+  const lastDigit = num % 10;
+
+  if (lastTwoDigits >= 11 && lastTwoDigits <= 13) {
+    return `${num}${"th"}`;
+  }
+
+  switch (lastDigit) {
+    case 1:
+      return `${num}${"st"}`;
+    case 2:
+      return `${num}${"nd"}`;
+    case 3:
+      return `${num}${"rd"}`;
+    default:
+      return `${num}${"th"}`;
+  }
 }
 
+console.log(getOrdinalNumber(3));
+
 module.exports = getOrdinalNumber;

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

@@ -18,3 +18,29 @@ test("should append 'st' for numbers ending with 1, except those ending with 11"
   expect(getOrdinalNumber(21)).toEqual("21st");
   expect(getOrdinalNumber(131)).toEqual("131st");
 });
+
+// Case 2: Numbers ending in 2 → add nd → (2nd, 22nd, 42nd)
+test("should append 'st' for numbers ending with 1, except those ending with 11", () => {
+  expect(getOrdinalNumber(2)).toEqual("2nd");
+  expect(getOrdinalNumber(22)).toEqual("22nd");
+  expect(getOrdinalNumber(142)).toEqual("142nd");
+});
+// Case 3: Numbers ending in 3 → add rd → (3rd, 23rd, 53rd)
+test("should append 'st' for numbers ending with 1, except those ending with 11", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+  expect(getOrdinalNumber(33)).toEqual("33rd");
+  expect(getOrdinalNumber(153)).toEqual("153rd");
+});
+// Case 4: All other numbers → add th → (4th, 6th, 20th, 100th)
+test("should append 'st' for numbers ending with 1, except those ending with 11", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(20)).toEqual("20th");
+  expect(getOrdinalNumber(100)).toEqual("100th");
+});
+// Exceptions: Numbers ending in 11, 12, and 13 use -th (e.g., 11th, 12th, 13th). 
+test("should append 'st' for numbers ending with 1, except those ending with 11", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(113)).toEqual("113th");
+});
+