NW | 25-ITP-Sep | TzeMing Ho | Sprint 3 | coursework/sprint-3-practice-tdd

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

@@ -1,5 +1,22 @@
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  let arrayOfCharacters = [];
+  if (typeof stringOfCharacters === "string") {
+    arrayOfCharacters = stringOfCharacters.split("");
+  } else if (Array.isArray(stringOfCharacters)) {
+    arrayOfCharacters = stringOfCharacters;
+  } else if (typeof stringOfCharacters === "number") {
+    arrayOfCharacters = stringOfCharacters.toString().split("");
+  } else if (typeof stringOfCharacters === "object") {
+    return 0;
+  }
+
+  let count = 0;
+  for (let index = 0; index < arrayOfCharacters.length; index++) {
+    if (arrayOfCharacters[index] === findCharacter) {
+      count += 1;
+    }
+  }
+  return count;
 }
 
 module.exports = countChar;

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

@@ -14,11 +14,42 @@ test("should count multiple occurrences of a character", () => {
   const str = "aaaaa";
   const char = "a";
   const count = countChar(str, char);
-  expect(count).toEqual(5);
+  expect(parseInt(count)).toEqual(5);
 });
 
 // Scenario: No Occurrences
 // Given the input string str,
 // 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 when character does not exist in the string", () => {
+  const str = "abcdefg";
+  const char = "h";
+  const count = countChar(str, char);
+  expect(parseInt(count)).toEqual(0);
+});
+
+// test for empty string
+test("should return 0 when string is empty", () => {
+  const str = "";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(parseInt(count)).toEqual(0);
+});
+
+// test for str is an array
+test("should return 0 when str is an array", () => {
+  const str = ["a", "b", "c"];
+  const char = "a";
+  const count = countChar(str, char);
+  expect(parseInt(count)).toEqual(1);
+});
+
+// test for str is a number
+test("should return 0 when str is a number", () => {
+  const str = 12345;
+  const char = "3";
+  const count = countChar(str, char);
+  expect(parseInt(count)).toEqual(1);
+});

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

@@ -1,5 +1,21 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  const stringNum = String(num);
+  const paddedLast2Digit = stringNum.padStart(2, "0").slice(-2);
+  const numberValue = Number(paddedLast2Digit);
+
+  if (numberValue >= 11 && numberValue <= 13) {
+    return `${stringNum}th`;
+  }
+  if (stringNum.endsWith("1")) {
+    return `${stringNum}st`;
+  }
+  if (stringNum.endsWith("2")) {
+    return `${stringNum}nd`;
+  }
+  if (stringNum.endsWith("3")) {
+    return `${stringNum}rd`;
+  }
+  return `${stringNum}th`;
 }
 
 module.exports = getOrdinalNumber;

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

@@ -11,3 +11,63 @@ 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 '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 '22nd' for 22", () => {
+  expect(getOrdinalNumber(22)).toEqual("22nd");
+});
+test("should return '23rd' for 23", () => {
+  expect(getOrdinalNumber(23)).toEqual("23rd");
+});
+test("should return '24th' for 24", () => {
+  expect(getOrdinalNumber(24)).toEqual("24th");
+});
+test("should return '111th' for 111", () => {
+  expect(getOrdinalNumber(111)).toEqual("111th");
+});
+test("should return '112th' for 112", () => {
+  expect(getOrdinalNumber(112)).toEqual("112th");
+});
+test("should return '113th' for 113", () => {
+  expect(getOrdinalNumber(113)).toEqual("113th");
+});
+test("should return '121st' for 121", () => {
+  expect(getOrdinalNumber(121)).toEqual("121st");
+});
+test("should return '1000011th' for 1000011", () => {
+  expect(getOrdinalNumber(1000011)).toEqual("1000011th");
+});
+test("should return '1000002nd' for 1000002", () => {
+  expect(getOrdinalNumber(1000002)).toEqual("1000002nd");
+});
+test("should return '0th' for 0", () => {
+  expect(getOrdinalNumber(0)).toEqual("0th");
+});
+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");
+});

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

@@ -1,5 +1,12 @@
-function repeat() {
-  return "hellohellohello";
+function repeat(str, count) {
+  if ((Number(count) < 0) | (typeof str === "object")) {
+    throw new Error("Invalid data value");
+  }
+  try {
+    return String(str).repeat(Number(count));
+  } catch (error) {
+    throw new Error("Invalid data value");
+  }
 }
 
 module.exports = repeat;

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

@@ -20,13 +20,84 @@ 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 string 1 time when count is 1", () => {
+  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 throw an error when count is negative", () => {
+  const str = "hello";
+  const count = -2;
+  expect(() => repeat(str, count)).toThrow("Invalid data value");
+});
+
+// case: str is not a string:
+// Given a non-string input for str (e.g., a number) and a positive integer count,
+// When the repeat function is called with these inputs,
+// Then it should convert the non-string str to a string and repeat it count times, returning the appropriately repeated string.
+test("should convert non-string str to string and repeat it count times", () => {
+  const str = 123;
+  const count = 2;
+  const repeatedStr = repeat(str, count);
+  expect(repeatedStr).toEqual("123123");
+});
+
+// case: count is not a number:
+// Given a target string str and a non-numeric input for count (e.g., a string that can be converted to a number),
+// When the repeat function is called with these inputs,
+// Then it should convert the non-numeric count to a number and repeat the str that many times, returning the appropriately repeated string.
+test("should convert non-numeric count to number and repeat the string that many times", () => {
+  const str = "hello";
+  const count = "3";
+  const repeatedStr = repeat(str, count);
+  expect(repeatedStr).toEqual("hellohellohello");
+});
+
+// case: count is a decimal number:
+// Given a target string str and a decimal number for count,
+// When the repeat function is called with these inputs,
+// Then it should round down the count to the nearest integer and repeat the str that many times, returning the appropriately repeated string.
+test("should round down decimal count to nearest integer and repeat the string that many times", () => {
+  const str = "hello";
+  const count = 3.7;
+  const repeatedStr = repeat(str, count);
+  expect(repeatedStr).toEqual("hellohellohello");
+});
+
+// case: str is an empty string:
+// Given an empty string for str and a positive integer count,
+// When the repeat function is called with these inputs,
+// Then it should return an empty string, as repeating an empty string any number of times still results in an empty string.
+test("should return an empty string when str is an empty string", () => {
+  const str = "";
+  const count = 5;
+  const repeatedStr = repeat(str, count);
+  expect(repeatedStr).toEqual("");
+});
+
+// case: invalid str and count types:
+// Given invalid types for both str (e.g., an object) and count (e.g., an array),
+// When the repeat function is called with these inputs,
+// Then it should throw an error or return an appropriate error message, indicating that the input types are not supported.
+test("should throw an error when str and count are of invalid types", () => {
+  const str = { text: "hello" };
+  const count = [3];
+  expect(() => repeat(str, count)).toThrow("Invalid data value");
+});