implemented getOrdinalNumber function and associated tests

Author: i786m

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

@@ -1,5 +1,25 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  switch (num % 100) {
+    case 11:
+    case 12:
+    case 13:
+      return num + "th";
+      break;
+  }
+  switch (num % 10) {
+    case 1:
+      return num + "st";
+      break;
+    case 2:
+      return num + "nd";
+      break;
+    case 3:
+      return num + "rd";
+      break;
+    default:
+      return num + "th";
+      break;
+  }
 }
 
 module.exports = getOrdinalNumber;

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

@@ -11,3 +11,51 @@ const getOrdinalNumber = require("./get-ordinal-number");
 test("should return '1st' for 1", () => {
   expect(getOrdinalNumber(1)).toEqual("1st");
 });
+
+test("should return '2nd' for 2", () => {
+  expect(getOrdinalNumber(2)).toEqual("2nd");
+});
+
+test("should return '3rd' for 3", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+});
+
+test("should return '4th' for 4", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+});
+
+test("should return '11th' for 11", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+});
+
+test("should return '12th' for 12", () => {
+  expect(getOrdinalNumber(12)).toEqual("12th");
+});
+
+test("should return '13th' for 13", () => {
+  expect(getOrdinalNumber(13)).toEqual("13th");
+});
+
+test("should return '21st' for 21", () => {
+  expect(getOrdinalNumber(21)).toEqual("21st");
+});
+
+test("should return '22nd' for 22", () => {
+  expect(getOrdinalNumber(22)).toEqual("22nd");
+});
+
+test("should return '23rd' for 23", () => {
+  expect(getOrdinalNumber(23)).toEqual("23rd");
+});
+
+test("should return '101st' for 101", () => {
+  expect(getOrdinalNumber(101)).toEqual("101st");
+});
+
+test("should return '111th' for 111", () => {
+  expect(getOrdinalNumber(111)).toEqual("111th");
+});
+
+test("should return '0th' for 0", () => {
+  expect(getOrdinalNumber(0)).toEqual("0th");
+});