London | 26-ITP-Jan | Alex Okorefe | Sprint 3 | Practice TDD

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

@@ -1,5 +1,17 @@
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  // 1. Assign a variable to keep track of the count
+  let count = 0;
+
+  // 2. Loop through all chars in the string
+  for (let char = 0; char < stringOfCharacters.length; char++) {
+    // 3. Check if the current char matches the one we are looking for
+    if (stringOfCharacters[char] === findCharacter) {
+      count++; // If it's a match, add 1 to our tally
+    }
+  }
+
+  // 4. Return the final tally after the loop finishes
+  return count;
 }
 
 module.exports = countChar;

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

@@ -22,3 +22,10 @@ test("should count multiple occurrences of a character", () => {
 // 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 occur in the string", () => {
+  const str = "Will this work?";
+  const char = "z";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});

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

@@ -1,5 +1,26 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  // Calculate the remainder when divided by 100 to check for 11, 12, 13
+  const lastTwoDigits = number % 100;
+
+  // Calculate the remainder when divided by 10 to get the single last digit
+  const lastDigit = number % 10;
+
+  // 1. The "teen" exceptions (11th, 12th, 13th)
+  if (lastTwoDigits >= 11 && lastTwoDigits <= 13) {
+    return number + "th";
+  }
+
+  // 2. Apply standard rules based on last digit
+  if (lastDigit === 1) {
+    return number + "st";
+  } else if (lastDigit === 2) {
+    return number + "nd";
+  } else if (lastDigit === 3) {
+    return number + "rd";
+  } else {
+    // Cover 0, 4, 5, 6, 7, 8, and 9
+    return number + "th";
+  }
 }
 
 module.exports = getOrdinalNumber;

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

@@ -18,3 +18,43 @@ 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(172)).toEqual("172nd");
+});
+
+// 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(4393)).toEqual("4393rd");
+});
+
+// Case 4: Numbers ending with 11, 12, or 13
+// When the number ends with 11, 12, or 13,
+// Then the function should return a string by appending "th" to the number.
+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");
+});
+
+// Case 5: Numbers ending with 0, 4, 5, 6, 7, 8, or 9
+// When the number ends with 0, 4, 5, 6, 7, 8, or 9,
+// Then the function should return a string by appending "th" to the number.
+test("should append 'th' for numbers ending with 0, 4, 5, 6, 7, 8, or 9", () => {
+  expect(getOrdinalNumber(150)).toEqual("150th");
+  expect(getOrdinalNumber(6584)).toEqual("6584th");
+  expect(getOrdinalNumber(85)).toEqual("85th");
+  expect(getOrdinalNumber(659326)).toEqual("659326th");
+  expect(getOrdinalNumber(567)).toEqual("567th");
+  expect(getOrdinalNumber(888)).toEqual("888th");
+  expect(getOrdinalNumber(6589)).toEqual("6589th");
+});

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

@@ -1,5 +1,25 @@
-function repeatStr() {
-  return "hellohellohello";
+function repeatStr(stringToRepeat, numberOfRepetitions) {
+  // Handle count of 0
+  if (numberOfRepetitions === 0) {
+    return "";
+  }
+
+  // Handle count of 1
+  if (numberOfRepetitions === 1) {
+    return stringToRepeat;
+  }
+
+  // Handle multiple repetitions (> than 1)
+  if (numberOfRepetitions > 1) {
+    let finalString = "";
+
+    // loop for repeating the string and concatenating it to the final string
+    for (let repetition = 0; repetition < numberOfRepetitions; repetition++) {
+      finalString = finalString + stringToRepeat;
+    }
+
+    return finalString;
+  }
 }
 
 module.exports = repeatStr;

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

@@ -21,12 +21,32 @@ test("should repeat the string count times", () => {
 // 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 = "CYF";
+  const count = 1;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("CYF");
+});
+
 // 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 count is 0", () => {
+  const str = "test";
+  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 count is negative", () => {
+  const str = "error";
+  const count = -1;
+  expect(() => repeatStr(str, count)).toThrow("Negative count is not valid");
+});