Implement the function and test.

Author: tasleemadedokun

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

@@ -1,5 +1,26 @@
+
 function getOrdinalNumber(num) {
-  return "1st";
+  const absNum = Math.abs(num); // handle negative numbers
+  const lastTwo = absNum % 100; // get last two digits
+  const lastDigit = absNum % 10; // get last digit
+
+  if (lastTwo >= 11 && lastTwo <= 13) {
+    return num + "th"; // exceptions: 11,12,13
+  }
+
+  switch (lastDigit) {
+    case 1:
+      return num + "st";
+    case 2:
+      return num + "nd";
+    case 3:
+      return num + "rd";
+    default:
+      return num + "th";
+  }
 }
+console.log(getOrdinalNumber(12)); //printed 12th.
+console.log(getOrdinalNumber(123)); // printed 123rd.
+console.log(getOrdinalNumber(52));  // printed 52nd.
 
 module.exports = getOrdinalNumber;

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

@@ -18,3 +18,31 @@ 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)
+// When the number ends with 2, except those ending with 12,
+// Then the function should return a string by appending "nd" to the number.
+test("should append 'nd' for numbers ending with 2, except those ending with 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)
+//When the number ends with 3, except those ending with 13,
+//Then the function should return a string by appending "rd" to the number.
+test("should append 'rd' for numbers ending with 3, except those ending with 13", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+  expect(getOrdinalNumber(23)).toEqual("23rd");
+  expect(getOrdinalNumber(133)).toEqual("133rd");
+});
+
+// Case 4: Numbers ending with (0, 4-9,11-13)
+// //Then the function should return a string by appending "th" to the number.
+test("should append 'th' for numbers ending with 0, 4-9, or 11-13", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(10)).toEqual("10th");
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+});