West Midlands | 25 Sep ITP | Iswat Bello | Sprint 3 | 2 Practice TDD

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

@@ -1,5 +1,23 @@
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  // Check both inputs are strings
+  if (
+    typeof stringOfCharacters !== "string" ||
+    typeof findCharacter !== "string"
+  ) {
+    return "Invalid input: input should be a string";
+  }
+
+  // Convert both to lowercase for case-insensitive matching
+  const str = stringOfCharacters.toLowerCase();
+  const char = findCharacter.toLowerCase();
+
+  // Check that only one character is passed
+  if (char.length !== 1) {
+    return "invalid input: Input just one character";
+  }
+
+  // Return count (0 for empty strings works naturally)
+  return str.split(char).length - 1;
 }
 
 module.exports = countChar;

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

@@ -22,3 +22,71 @@ 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 occurence of a character", () => {
+  const str = "happy";
+  const char = "z";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+
+// Scenario: One occurrence
+// Given an input string `str`,
+// And a character `char` that occurs once within `str` (e.g., 'a' in 'boat'),
+// When the function is called with these inputs,
+// Then it should correctly return the count of `char` (e.g., 'a' appears once in 'boat').
+
+test("should return 1 occurence of a character", () => {
+  const str = "boat";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(1);
+});
+
+test("should return 0 occurrence of character in an empty string", () => {
+  const str = "";
+  const char = "b";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+
+test("should throw an error when more than one string is passed as char", () => {
+  const str = "jump";
+  const char = "pp";
+  const count = countChar(str, char);
+  expect(count).toEqual("invalid input: Input just one character");
+});
+
+test("should count characters regardless of case (treat 'a' and 'A' as equal)", () => {
+  const str = "JUMP";
+  const char = "m";
+  const count = countChar(str, char);
+  expect(count).toEqual(1);
+});
+
+test("should return correct count of space characters", () => {
+  const str = "F r o NT";
+  const char = " ";
+  const count = countChar(str, char);
+  expect(count).toEqual(3);
+});
+
+test("should count numeric characters correctly in the string", () => {
+  const str = "2Languages6";
+  const char = "2";
+  const count = countChar(str, char);
+  expect(count).toEqual(1);
+});
+
+test("should correctly count characters in a very long string", () => {
+  const str = "b".repeat(500) + "abB";
+  const char = "b";
+  const count = countChar(str, char);
+  expect(count).toEqual(502);
+});
+
+test("should count numeric characters correctly in the string", () => {
+  const str = "2Languages6";
+  const char = 2;
+  const count = countChar(str, char);
+  expect(count).toEqual("Invalid input: input should be a string");
+});

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

@@ -1,5 +1,32 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  // Early return for invalid inputs
+  if (!Number.isInteger(num)) {
+    return "Invalid input: Input is an integer";
+  }
+
+  const absNum = Math.abs(num);
+  const lastTwo = absNum % 100;
+  const lastDigit = absNum % 10;
+
+  // Handle special cases: 11th, 12th, 13th
+  if (lastTwo === 11 || lastTwo === 12 || lastTwo === 13) {
+    return `${num}th`;
+  }
+
+  // Handle regular suffixes
+  if (lastDigit === 1) {
+    return `${num}st`;
+  }
+
+  if (lastDigit === 2) {
+    return `${num}nd`;
+  }
+
+  if (lastDigit === 3) {
+    return `${num}rd`;
+  }
+  // Default suffix
+  return `${num}th`;
 }
 
 module.exports = getOrdinalNumber;

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

@@ -11,3 +11,81 @@ const getOrdinalNumber = require("./get-ordinal-number");
 test("should return '1st' for 1", () => {
   expect(getOrdinalNumber(1)).toEqual("1st");
 });
+
+test("should return '2nd' for 2", () => {
+  expect(getOrdinalNumber(2)).toEqual("2nd");
+});
+
+test("should return '3rd' for 3", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+});
+
+test("should return '4th' for 4", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+});
+
+test("should return '10th' for 10", () => {
+  expect(getOrdinalNumber(10)).toEqual("10th");
+});
+
+test("should return '11th' for 11", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+});
+
+test("should return '12th' for 12", () => {
+  expect(getOrdinalNumber(12)).toEqual("12th");
+});
+
+test("should return '13th' for 13", () => {
+  expect(getOrdinalNumber(13)).toEqual("13th");
+});
+
+test("should return '21st' for 21", () => {
+  expect(getOrdinalNumber(21)).toEqual("21st");
+});
+
+test("should return '23rd' for 23", () => {
+  expect(getOrdinalNumber(23)).toEqual("23rd");
+});
+
+test("should return '22nd' for 22", () => {
+  expect(getOrdinalNumber(22)).toEqual("22nd");
+});
+
+test("should return '100th' for 100", () => {
+  expect(getOrdinalNumber(100)).toEqual("100th");
+});
+
+test("should return '111th' for 111", () => {
+  expect(getOrdinalNumber(111)).toEqual("111th");
+});
+
+test("should return '0th' for 0", () => {
+  expect(getOrdinalNumber(0)).toEqual("0th");
+});
+
+test("should return '-111th' for -111", () => {
+  expect(getOrdinalNumber(-111)).toEqual("-111th");
+});
+
+test("should return 'Invalid input: Input is an integer' for 1.52", () => {
+  expect(getOrdinalNumber(1.52)).toEqual("Invalid input: Input is an integer");
+});
+
+test("should return 'Invalid input: Input is an integer' for null", () => {
+  expect(getOrdinalNumber(null)).toEqual("Invalid input: Input is an integer");
+});
+
+test("should return 'Invalid input: Input is an integer' for undefined", () => {
+  expect(getOrdinalNumber(undefined)).toEqual(
+    "Invalid input: Input is an integer"
+  );
+});
+
+test("should return 'Invalid input: Input is an integer' for 'a'", () => {
+  expect(getOrdinalNumber("a")).toEqual("Invalid input: Input is an integer");
+});
+
+test("should return 'Invalid input: Input is an integer' for {}", () => {
+  expect(getOrdinalNumber({})).toEqual("Invalid input: Input is an integer");
+});

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

@@ -1,5 +1,30 @@
-function repeat() {
-  return "hellohellohello";
+function repeat(valueToRepeat, numOfTimes) {
+  // Validate count
+  if (!Number.isInteger(numOfTimes)) {
+    return "Invalid count: count should be an integer";
+  }
+  if (numOfTimes < 0) {
+    return "Negative number invalid";
+  }
+  if (numOfTimes === 0) {
+    return "";
+  }
+
+  // Convert arrays to empty string
+  if (Array.isArray(valueToRepeat)) {
+    valueToRepeat = "";
+  }
+
+  // Convert other types to string
+  const strValue = String(valueToRepeat);
+
+  // Repeat the string
+  let repeatedValue = "";
+  for (let i = 0; i < numOfTimes; i++) {
+    repeatedValue += strValue;
+  }
+
+  return repeatedValue;
 }
 
 module.exports = repeat;

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

@@ -20,13 +20,98 @@ test("should repeat the string count times", () => {
 // Given a target string str and a count equal to 1,
 // 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 return the original input with no repetition", () => {
+  const str = "milk";
+  const count = 1;
+  const repeatedStr = repeat(str, count);
+  expect(repeatedStr).toEqual(str);
+})
 
 // 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 for zero count times", () => {
+  const str = "rice";
+  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 return an error message", () => {
+  const str = "food";
+  const count = -2;
+  const repeatedStr = repeat(str, count);
+  expect(repeatedStr).toEqual("Negative number invalid");
+})
+
+test("should return an empty string when empty string is expected count number of times", () => {
+  const str = "";
+  const count = 23;
+  const repeatedStr = repeat(str, count);
+  expect(repeatedStr).toEqual("");
+})
+
+test("should repeat the number count times as a string", () => {
+  const str = 1;
+  const count = 3;
+  const repeatedStr = repeat(str, count);
+  expect(repeatedStr).toEqual("111");
+});
+
+test("should repeat boolean count times as a string", () => {
+  const str = true;
+  const count = 2;
+  const repeatedStr = repeat(str, count);
+  expect(repeatedStr).toEqual("truetrue");
+});
+
+test("should repeat null count times as a string", () => {
+  const str = null;
+  const count = 2;
+  const repeatedStr = repeat(str, count);
+  expect(repeatedStr).toEqual("nullnull");
+});
+
+test("should repeat undefined count times as a string", () => {
+  const str = undefined;
+  const count = 2;
+  const repeatedStr = repeat(str, count);
+  expect(repeatedStr).toEqual("undefinedundefined");
+});
+
+// case: array input
+test("should repeat [] count times as a string", () => {
+  const str = [];
+  const count = 2;
+  const repeatedStr = repeat(str, count);
+  expect(repeatedStr).toEqual("");
+});
+
+// case: Non-integer positive count
+test("should return an error message for non-integer positive count", () => {
+  const str = "apple";
+  const count = 2.5;
+  const repeatedStr = repeat(str, count);
+  expect(repeatedStr).toEqual("Invalid count: count should be an integer");
+});
+
+// case: Non-integer negative count
+test("should return an error message for non-integer negative count", () => {
+  const str = "banana";
+  const count = -1.7;
+  const repeatedStr = repeat(str, count);
+  expect(repeatedStr).toEqual("Invalid count: count should be an integer");
+});
+
+// case: Object input
+test("should repeat an object count times as a string", () => {
+  const str = {};
+  const count = 2;
+  const repeatedStr = repeat(str, count);
+  expect(repeatedStr).toEqual("[object Object][object Object]");
+});