London | 26-ITP-Sep | Rhoda Ajiroba | Sprint 3 | Practice TDD

practice-tdd/count.js

@@ -1,3 +1,3 @@
 export function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  return stringOfCharacters.split(findCharacter).length - 1;
 }

practice-tdd/count.test.js

@@ -17,8 +17,17 @@ test("should count multiple occurrences of a character", () => {
   expect(count).toEqual(5);
 });
 
-// Scenario: No Occurrences
-// Given the input string `str`,
-// And a character `char` that does not exist within `str`.
-// When the function is called with these inputs,
-// Then it should return 0, indicating that no occurrences of `char` were found.
+test("should return 0 when the character does not exist", () => {
+  const str = "hello";
+  const char = "z";
+
+  const count = countChar(str, char);
+
+  expect(count).toEqual(0);
+});
+test("should count a single occurrence", () => {
+  expect(countChar("hello", "h")).toEqual(1);
+});
+test("should return 0 for an empty string", () => {
+  expect(countChar("", "a")).toEqual(0);
+});

practice-tdd/get-ordinal-number.js

@@ -1,3 +1,23 @@
 export function getOrdinalNumber(num) {
-  return "1st";
+  const lastTwoDigits = num % 100;
+
+  if (lastTwoDigits >= 11 && lastTwoDigits <= 13) {
+    return `${num}th`;
+  }
+
+  const lastDigit = num % 10;
+
+  if (lastDigit === 1) {
+    return `${num}st`;
+  }
+
+  if (lastDigit === 2) {
+    return `${num}nd`;
+  }
+
+  if (lastDigit === 3) {
+    return `${num}rd`;
+  }
+
+  return `${num}th`;
 }

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

@@ -18,3 +18,28 @@ 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 in 2, except those ending in 12", () => {
+  expect(getOrdinalNumber(2)).toEqual("2nd");
+  expect(getOrdinalNumber(22)).toEqual("22nd");
+  expect(getOrdinalNumber(112)).toEqual("112th");
+});
+
+test("should append 'rd' for numbers ending in 3, except those ending in 13", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+  expect(getOrdinalNumber(23)).toEqual("23rd");
+  expect(getOrdinalNumber(113)).toEqual("113th");
+});
+
+test("should append 'th' for other numbers", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(5)).toEqual("5th");
+  expect(getOrdinalNumber(10)).toEqual("10th");
+  expect(getOrdinalNumber(20)).toEqual("20th");
+});
+
+test("should append 'th' for numbers ending in 11, 12 and 13", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+});

practice-tdd/repeat-str.js

@@ -1,5 +1,13 @@
-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) {
+  if (count < 0) {
+    throw new Error("Count cannot be negative");
+  }
+
+  let result = "";
+
+  for (let i = 0; i < count; i++) {
+    result += str;
+  }
+
+  return result;
 }

practice-tdd/repeat-str.test.js

@@ -16,17 +16,23 @@ 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;
 
-// 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.
+  const repeatedStr = repeatStr(str, count);
 
-// 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.
+  expect(repeatedStr).toEqual("hello");
+});
+test("should return an empty string when count is 0", () => {
+  const str = "hello";
+  const count = 0;
+
+  const repeatedStr = repeatStr(str, count);
+
+  expect(repeatedStr).toEqual("");
+});
+
+test("should throw an error when count is negative", () => {
+  expect(() => repeatStr("hello", -1)).toThrow();
+});