get ordinal test - tdd

Author: abmhts

practice-tdd/get-ordinal-number.js

@@ -1,3 +1,10 @@
 export function getOrdinalNumber(num) {
-  return "1st";
+  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";
+  }
+  return num + "th";
 }

practice-tdd/get-ordinal-number.test.js

@@ -18,3 +18,25 @@ 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 with 2 (but not 12)
+test("should append 'nd' for numbers ending with 2, except 12", () => {
+  expect(getOrdinalNumber(2)).toEqual("2nd");
+  expect(getOrdinalNumber(22)).toEqual("22nd");
+  expect(getOrdinalNumber(132)).toEqual("132nd");
+});
+// Case 3: Numbers ending with 3 (but not 13)
+test("should append 'rd' for numbers ending with 3, except 13", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+  expect(getOrdinalNumber(23)).toEqual("23rd");
+  expect(getOrdinalNumber(133)).toEqual("133rd");
+});
+// Case 4: Numbers ending with "th" including the special case (11,12,13)
+test(`Numbers ending with "th" including the special case (11,12,13)`, () => {
+  expect(getOrdinalNumber(10)).toEqual("10th");
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+  expect(getOrdinalNumber(14)).toEqual("14th");
+  expect(getOrdinalNumber(5)).toEqual("5th");
+  expect(getOrdinalNumber(4)).toEqual("4th");
+});