Birmingham | ITP Jan-2026 | Arunkumar Akilan | Sprint 3 | Practice TDD

Sprint-3/2-practice-tdd/count.js

@@ -1,5 +1,12 @@
-function countChar(stringOfCharacters, findCharacter) {
-  return 5
+function countChar(str, char) {
+  let count = 0;
+  for (let i = 0; i < str.length; i++)
+  if(str[i] === char)
+  {
+    count++;
+  }
+  return count;
 }
 
+
 module.exports = countChar;

Sprint-3/2-practice-tdd/count.test.js

@@ -16,6 +16,12 @@ test("should count multiple occurrences of a character", () => {
   const count = countChar(str, char);
   expect(count).toEqual(5);
 });
+test("should count no occurrences of a character",()=>{
+  const str = "hello";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
 
 // Scenario: No Occurrences
 // Given the input string `str`,

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

@@ -1,5 +1,15 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  const lastDigit = num % 10; 
+  const lastTwoDigits = num % 100; 
+  if (lastDigit === 1 && lastTwoDigits !== 11) {
+    return `${num}st`;
+  } else if (lastDigit === 2 && lastTwoDigits !== 12) {
+    return `${num}nd`;
+  } else if (lastDigit === 3 && lastTwoDigits !== 13) {
+    return `${num}rd`;
+  } else {
+    return `${num}th`;
+  }
 }
 
 module.exports = getOrdinalNumber;

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

@@ -18,3 +18,39 @@ 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 '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");
+});
+test("should append 'rd' for numbers ending with 3, except those ending with 13", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+  expect(getOrdinalNumber(33)).toEqual("33rd");
+  expect(getOrdinalNumber(133)).toEqual("133rd");
+});
+test("should append 'th' for numbers ending with 11, 12, or 13", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+
+  expect(getOrdinalNumber(111)).toEqual("111th");
+  expect(getOrdinalNumber(112)).toEqual("112th");
+  expect(getOrdinalNumber(113)).toEqual("113th");
+});
+test("should append 'th' for numbers ending with 0, 4–9", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(10)).toEqual("10th");
+  expect(getOrdinalNumber(25)).toEqual("25th");
+  expect(getOrdinalNumber(36)).toEqual("36th");
+  expect(getOrdinalNumber(48)).toEqual("48th");
+  expect(getOrdinalNumber(27)).toEqual("27th");
+  expect(getOrdinalNumber(9)).toEqual("9th");
+});
+
+
+
+
+
+
+

Sprint-3/2-practice-tdd/repeat-str.js

@@ -1,5 +1,26 @@
-function repeatStr() {
-  return "hellohellohello";
+function repeatStr(str, count) {
+  if (count <0)
+  {
+  throw new Error("negative counts are not valid");
+  }
+  else if(count === 1)
+  {
+    return str;
+  }
+  else if (count === 0)
+  {
+    return "";
+  }
+  else 
+  {
+    let result ="";
+    for (let i =0; i<count;i++)
+    {
+
+      result =result+str;
+    }
+    return result;
+  }
 }
 
 module.exports = repeatStr;

Sprint-3/2-practice-tdd/repeat-str.test.js

@@ -9,11 +9,25 @@ const repeatStr = require("./repeat-str");
 // When the repeatStr function is called with these inputs,
 // Then it should return a string that contains the original `str` repeated `count` times.
 
-test("should repeat the string count times", () => {
+test("should repeat the string count times when count is greater than 1", () => {
   const str = "hello";
   const count = 3;
-  const repeatedStr = repeatStr(str, count);
-  expect(repeatedStr).toEqual("hellohellohello");
+  expect(repeatStr(str, count)).toEqual("hellohellohello");
+});
+test(" should return original string when count is 1", () => {
+  const str = "hello";
+  const count = 1;
+  expect(repeatStr(str, count)).toEqual("hello");
+});
+test("should return empty string when count is 0", () => {
+  const str = "hello";
+  const count = 0;
+  expect(repeatStr(str, count)).toEqual("");
+});
+test("should throw an error when count is negative", () => {
+  const str = "hello";
+  const count = -1;
+  expect(() => repeatStr(str, count)).toThrow();
 });
 
 // Case: handle count of 1: