Implement getOrdinalNumber function and add comprehensive tests for ordinal suffixes

Author: chefmatthaus-hub

practice-tdd/get-ordinal-number.js

@@ -1,3 +1,21 @@
 export function getOrdinalNumber(num) {
-  return "1st";
+
+  if (num % 100 === 11 || num % 100 === 12 || num % 100 === 13) {
+    return num + "th";
+  };
+  
+  if (num % 10 === 1) {
+    return num + "st";
+  };
+
+  if (num % 10 === 2) {
+    return num + "nd";
+  };
+
+  if (num % 10 === 3) {
+    return num + "rd";
+  };
+  
+  return num + "th";
 }
+

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

@@ -18,3 +18,64 @@ test("should append 'st' for numbers ending with 1, except those ending with 11"
   expect(getOrdinalNumber(21)).toEqual("21st");
   expect(getOrdinalNumber(131)).toEqual("131st");
 });
+
+test("should append 'th' for numbers ending with 11", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(111)).toEqual("111th");
+  expect(getOrdinalNumber(2111)).toEqual("2111th");
+});
+
+test("should append 'nd' for numbers ending with 2 except those ending in 12", () => {
+  expect(getOrdinalNumber(2)).toEqual("2nd");
+  expect(getOrdinalNumber(22)).toEqual("22nd");
+  expect(getOrdinalNumber(4022)).toEqual("4022nd");
+});
+
+test("should append 'th' for numbers ending in 12", () => {
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(112)).toEqual("112th");
+  expect(getOrdinalNumber(1012)).toEqual("1012th");
+});
+
+test("should append 'rd' for numbers ending with 3 except those ending in 13", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+  expect(getOrdinalNumber(33)).toEqual("33rd");
+  expect(getOrdinalNumber(3033)).toEqual("3033rd");
+});
+
+test("should append 'th' for numbers ending in 13", () => {
+  expect(getOrdinalNumber(113)).toEqual("113th");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+  expect(getOrdinalNumber(1013)).toEqual("1013th");
+});
+
+test("should append 'th' for numbers ending in 4", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(14)).toEqual("14th");
+  expect(getOrdinalNumber(24)).toEqual("24th");
+});
+
+test("should append 'th' for numbers ending in 5", () => {
+  expect(getOrdinalNumber(5)).toEqual("5th");
+  expect(getOrdinalNumber(15)).toEqual("15th");
+  expect(getOrdinalNumber(1025)).toEqual("1025th");
+});
+
+test("should append 'th' for numbers ending in 6, 7, 8, 9", () => {
+  expect(getOrdinalNumber(6)).toEqual("6th");
+  expect(getOrdinalNumber(7)).toEqual("7th");
+  expect(getOrdinalNumber(8)).toEqual("8th");
+  expect(getOrdinalNumber(9)).toEqual("9th");
+});
+
+test("should append 'th' for numbers ending in 10", () => {
+  expect(getOrdinalNumber(10)).toEqual("10th");
+  expect(getOrdinalNumber(110)).toEqual("110th");
+  expect(getOrdinalNumber(1010)).toEqual("1010th");
+});
+
+test("should append 'th' for numbers ending in 20", () => {
+  expect(getOrdinalNumber(20)).toEqual("20th");
+  expect(getOrdinalNumber(120)).toEqual("120th");
+  expect(getOrdinalNumber(1120)).toEqual("1120th");
+});