Brussels | ITP-2026-1 | Benjamin Vanderzeypen | Sprint 3 | Coursework/sprint 3 practice ttd

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

@@ -1,5 +1,10 @@
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  let count = 0;
+  for (let i = 0; i < stringOfCharacters.length; i++)
+    if (stringOfCharacters[i] === findCharacter) {
+      count++;
+    }
+  return count;
 }
 
 module.exports = countChar;

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

@@ -22,3 +22,36 @@ test("should count multiple occurrences of a character", () => {
 // And a character char that does not exist within the case-sensitive str,
 // When the function is called with these inputs,
 // Then it should return 0, indicating that no occurrences of the char were found in the case-sensitive str.
+
+test("should return 0 for no occurrences of the character", () => {
+  const str = "hello world";
+  const char = "z";
+  const count = countChar(str, char); // Calls countChar with the test inputs and saves the returned value
+  expect(count).toEqual(0); // checks that your function returns 0 for that test case.
+});
+
+// Scenario: Single Occurrence
+// Given the input string str,
+// And a character char that appears exactly once in the case-sensitive str,
+// When the function is called with these inputs,
+// Then it should return 1, indicating a single occurrence of the char was found in the str.
+
+test("Should count the ocurrences of the character", () => {
+  const str = "hello world";
+  const char = "h";
+  const count = countChar(str, char);
+  expect(count).toEqual(1);
+});
+
+// Scenario: Case Sensitivity
+// Given the input string str containing both uppercase and lowercase versions of a character,
+// And a character char that matches only one case,
+// When the function is called with these inputs,
+// Then it should count only the exact case matches, not both.
+
+test("Should count the uppercase ocurrences of the character", () => {
+  const str = "heLLo world";
+  const char = "L";
+  const count = countChar(str, char);
+  expect(count).toEqual(2);
+});

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

@@ -1,5 +1,23 @@
-function getOrdinalNumber(num) {
-  return "1st";
+function getOrdinalNumber(inputNumber) {
+  inputNumber = Number(inputNumber); // Convert input to a number (handles string inputs edge case)
+  const absoluteNumber = Math.abs(inputNumber); // Use absolute value (handles negatives)
+  const lastTwo = absoluteNumber % 100; // Get the last two digits (for 'teens' exception)
+  let suffix = "th"; // Default suffix is 'th'
+
+  if (lastTwo < 11 || lastTwo > 13) {
+    // || is the "or" operator i learned by solving this function
+    // If not 11, 12, or 13, use last digit rule
+    const lastDigit = absoluteNumber % 10; // Get the last digit
+
+    if (lastDigit === 1) {
+      suffix = "st"; // 1st, 21st, etc.
+    } else if (lastDigit === 2) {
+      suffix = "nd"; // 2nd, 22nd, etc.
+    } else if (lastDigit === 3) {
+      suffix = "rd"; // 3rd, 23rd, etc.
+    }
+  }
+  return inputNumber + suffix; // Return the number with the correct suffix
 }
 
-module.exports = getOrdinalNumber;
+module.exports = getOrdinalNumber; // Export the function for use in other files

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

@@ -11,3 +11,59 @@ const getOrdinalNumber = require("./get-ordinal-number");
 test("should return '1st' for 1", () => {
   expect(getOrdinalNumber(1)).toEqual("1st");
 });
+
+// While i was doing my research I stumbled upon .toBe for exact equality.
+// .toBe() checks for exact equality using === (strict equality).
+// You can use it for primitive values: strings, numbers, booleans, null, or undefined.
+
+// Basics
+test("should return '2nd' for 2", () => {
+  expect(getOrdinalNumber(2)).toBe("2nd");
+});
+
+test("should return '3rd' for 3", () => {
+  expect(getOrdinalNumber(3)).toBe("3rd");
+});
+
+test("should return '4th' for 4", () => {
+  expect(getOrdinalNumber(4)).toBe("4th");
+});
+
+// Teens ordinal numbers
+test("should return '11th' for 11", () => {
+  expect(getOrdinalNumber(11)).toBe("11th");
+});
+
+test("should return '12th' for 12", () => {
+  expect(getOrdinalNumber(12)).toBe("12th");
+});
+
+test("should return '13th' for 13", () => {
+  expect(getOrdinalNumber(13)).toBe("13th");
+});
+
+// Last-digit rule
+test("should return '21st' for 21", () => {
+  expect(getOrdinalNumber(21)).toBe("21st");
+});
+
+test("should return '22nd' for 22", () => {
+  expect(getOrdinalNumber(22)).toBe("22nd");
+});
+
+test("should return '23rd' for 23", () => {
+  expect(getOrdinalNumber(23)).toBe("23rd");
+});
+
+test("should return '24th' for 24", () => {
+  expect(getOrdinalNumber(24)).toBe("24th");
+});
+
+// Edge cases
+test("should return '0th' for 0", () => {
+  expect(getOrdinalNumber(0)).toBe("0th");
+});
+
+test("should return '-1st' for -1", () => {
+  expect(getOrdinalNumber(-1)).toBe("-1st");
+});

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

@@ -1,5 +1,19 @@
-function repeat() {
-  return "hellohellohello";
+function repeat(str, count) {
+  if (count < 0) {
+    throw new Error("Count must be non-negative number"); // 'throw' creates and sends an error, stopping the function immediately
+  }
+  if (count === 0) {
+    return "";
+  }
+  if (count === 1) {
+    return str;
+  }
+  let result = ""; // Start with an empty string to build the result
+  for (let i = 0; i < count; i++) {
+    // Loop 'count' times (i starts at 0, goes up to count +1)
+    result += str; // Used an addition assignment operator. instead of result = result + str
+  }
+  return result;
 }
 
 module.exports = repeat;

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

@@ -21,12 +21,32 @@ test("should repeat the string count times", () => {
 // When the repeat function is called with these inputs,
 // Then it should return the original str without repetition, ensuring that a count of 1 results in no repetition.
 
+test("should count a single occurrence of the character", () => {
+  const str = "hello";
+  const count = 1;
+  const repeatedStr = repeat(str, count);
+  expect(repeatedStr).toEqual("hello");
+});
+
 // case: Handle Count of 0:
 // Given a target string str and a count equal to 0,
 // When the repeat function is called with these inputs,
 // Then it should return an empty string, ensuring that a count of 0 results in an empty output.
 
+test("should return an empty string when count is 0", () => {
+  const str = "hello";
+  const count = 0;
+  const repeatedStr = repeat(str, count);
+  expect(repeatedStr).toEqual("");
+});
+
 // case: Negative Count:
 // Given a target string str and a negative integer count,
 // When the repeat function is called with these inputs,
 // Then it should throw an error or return an appropriate error message, as negative counts are not valid.
+
+test("should trow an error when count is negative", () => {
+  const str = "hello";
+  const count = -2;
+  expect(() => repeat(str, count)).toThrow("Count must be non-negative number");
+});