Sheffield | 26-ITP-jan | Richard Frimpong | Sprint 3 | Practice TDD

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

@@ -1,5 +1,15 @@
+// implement a function countChar that counts the number of times a character occurs in a string
+
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  let count = 0;
+
+  for (const character of stringOfCharacters) {
+    if (character === findCharacter) {
+      count += 1;
+    }
+  }
+
+  return count;
 }
 
 module.exports = countChar;

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

@@ -1,5 +1,6 @@
 // implement a function countChar that counts the number of times a character occurs in a string
 const countChar = require("./count");
+
 // Given a string `str` and a single character `char` to search for,
 // When the countChar function is called with these inputs,
 // Then it should:
@@ -14,11 +15,33 @@ test("should count multiple occurrences of a character", () => {
   const str = "aaaaa";
   const char = "a";
   const count = countChar(str, char);
+
   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.
+// Then it should return 0.
+
+test("should return 0 when the character does not occur in the string", () => {
+  const str = "hello";
+  const char = "z";
+  const count = countChar(str, char);
+
+  expect(count).toEqual(0);
+});
+
+// Scenario: Mixed Characters
+// Given a string containing different characters
+// When searching for a character that appears some of the time
+// Then the function should count only matching characters
+
+test("should count matching characters in a mixed string", () => {
+  const str = "banana";
+  const char = "a";
+  const count = countChar(str, char);
+
+  expect(count).toEqual(3);
+});

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

@@ -1,5 +1,26 @@
-function getOrdinalNumber(num) {
-  return "1st";
+function getOrdinalNumber(number) {
+  const lastTwoDigits = number % 100;
+
+  // Special cases: 11, 12, 13 always use "th"
+  if (lastTwoDigits >= 11 && lastTwoDigits <= 13) {
+    return `${number}th`;
+  }
+
+  const lastDigit = number % 10;
+
+  if (lastDigit === 1) {
+    return `${number}st`;
+  }
+
+  if (lastDigit === 2) {
+    return `${number}nd`;
+  }
+
+  if (lastDigit === 3) {
+    return `${number}rd`;
+  }
+
+  return `${number}th`;
 }
 
 module.exports = getOrdinalNumber;

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

@@ -18,3 +18,41 @@ 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 11, 12, 13 (special cases)
+// These numbers should always end with "th".
+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");
+});
+
+// Case 5: All other numbers
+// Numbers that do not end with 1, 2, or 3 should end with "th".
+test("should append 'th' for all other numbers", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(10)).toEqual("10th");
+  expect(getOrdinalNumber(24)).toEqual("24th");
+  expect(getOrdinalNumber(100)).toEqual("100th");
+});

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

@@ -1,5 +1,19 @@
-function repeatStr() {
-  return "hellohellohello";
+// Implement a function repeatStr that repeats a string a given number of times
+
+function repeatStr(str, count) {
+  // Negative numbers are not valid
+  if (count < 0) {
+    throw new Error("Count cannot be negative");
+  }
+
+  // Repeat the string count times
+  let result = "";
+
+  for (let i = 0; i < count; i++) {
+    result += str;
+  }
+
+  return result;
 }
 
 module.exports = repeatStr;

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

@@ -1,32 +1,53 @@
 // Implement a function repeatStr
 const repeatStr = require("./repeat-str");
+
 // 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:
+// 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";
   const count = 3;
   const repeatedStr = repeatStr(str, count);
+
   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.
+// Case: handle count of 1
+// Given a target string `str` and a count equal to 1,
+// Then it should return the original string.
 
-// 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,
+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");
+});
+
+// Case: handle count of 0
+// Given a target string `str` and a count equal to 0,
 // Then it should return an empty string.
 
-// 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 return an empty string when count is 0", () => {
+  const str = "hello";
+  const count = 0;
+  const repeatedStr = repeatStr(str, count);
+
+  expect(repeatedStr).toEqual("");
+});
+
+// Case: handle negative count
+// Given a negative integer count,
+// Then the function should throw an error.
+
+test("should throw an error when count is negative", () => {
+  const str = "hello";
+  const count = -1;
+
+  expect(() => repeatStr(str, count)).toThrow();
+});