Cape Town | sep-2026-ITP | Matthaus Bause | Sprint 2 | TDD

practice-tdd/count.js

@@ -1,3 +1,8 @@
 export function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  let count = 0;
+  for (let i = 0; i < stringOfCharacters.length; i++)
+    if (stringOfCharacters[i] === findCharacter) {
+      count++;
+    }
+  return count;
 }

practice-tdd/count.test.js

@@ -17,6 +17,20 @@ test("should count multiple occurrences of a character", () => {
   expect(count).toEqual(5);
 });
 
+test("should return 0 when character is not found", () => {
+  const str = "hello";
+  const char = "z";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+
+test("should count 2 occurrences of n", () => {
+  const str = "banana";
+  const char = "n";
+  const count = countChar(str, char);
+  expect(count).toEqual(2);
+});
+
 // Scenario: No Occurrences
 // Given the input string `str`,
 // And a character `char` that does not exist within `str`.

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");
+});

practice-tdd/repeat-str.js

@@ -1,5 +1,12 @@
-export function repeatStr() {
-  // Your implementation of this function must *not* call String.prototype.repeat (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat).
-  // The goal is to re-implement that function, not to use it.
-  return "hellohellohello";
+export function repeatStr(str, count) {
+  let result = "";
+
+  for (let i = 0; i < count; i++) {
+    result = result + str;
+  }
+
+  if (count < 0) {
+    throw new Error("Count cannot be negative");
+  }
+    return result;  
 }

practice-tdd/repeat-str.test.js

@@ -1,13 +1,4 @@
-// Implement a function repeatStr
 import { repeatStr } from "./repeat-str.js";
-// Given a target string `str` and a positive integer `count`,
-// When the repeatStr function is called with these inputs,
-// Then it should:
-
-// Case: handle multiple repetitions:
-// Given a target string `str` and a positive integer `count` greater than 1,
-// 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", () => {
   const str = "hello";
@@ -16,17 +7,56 @@ test("should repeat the string count times", () => {
   expect(repeatedStr).toEqual("hellohellohello");
 });
 
-// Case: handle count of 1:
-// Given a target string `str` and a `count` equal to 1,
-// When the repeatStr function is called with these inputs,
-// Then it should return the original `str` without repetition.
+test("should return the original string when count is 1", () => {
+  const str = "hello";
+  const count = 1;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("hello");
+});
+
+test("should return an empty string", () => {
+  const str = "hello";
+  const count = 0;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("");
+});
+
+test("should throw an error when count is negative", () => {
+  const str = "hello";
+  const count = -2;
+  expect(() => repeatStr(str, count)).toThrow();
+});
+
+test("should return Backstreet Boys lyrics", () => {
+  const str = "bye";
+  const count = 5;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("byebyebyebyebye");
+});
+
+test("should return an empty string when repeating an empty string 3 times", () => {
+  const str = "";
+  const count = 3;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("");
+});
 
-// Case: Handle count of 0:
-// Given a target string `str` and a `count` equal to 0,
-// When the repeatStr function is called with these inputs,
-// Then it should return an empty string.
+test("should return an empty string when repeating an empty string once", () => {
+  const str = "";
+  const count = 1;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("");
+});
+
+test("should return an empty string when count is zero", () => {
+  const str = "";
+  const count = 0;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("");
+});
 
-// Case: Handle negative count:
-// Given a target string `str` and a negative integer `count`,
-// When the repeatStr function is called with these inputs,
-// Then it should throw an error, as negative counts are not valid.
+test("should throw an error when repeating an empty string a negative number of times", () => {
+  const str = "";
+  const count = -2;
+  expect(() => repeatStr(str, count)).toThrow("Count cannot be negative");
+});