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

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

@@ -1,5 +1,25 @@
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  let arrayOfCharacters = [];
+  if (typeof stringOfCharacters === "string") {
+    arrayOfCharacters = stringOfCharacters.split("");
+  } else {
+    throw new Error("Input str should be a string");
+  }
+
+  if (typeof findCharacter !== "string") {
+    throw new Error("Input char should be a string");
+  }
+  if (findCharacter.length !== 1) {
+    throw new Error("Input char should be a single character");
+  }
+
+  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 +14,149 @@ 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);
+});
+
+// tests for unhappy paths (invalid str)
+const errorMessageForString = "Input str should be a string";
+
+// test for str is an array
+test("should throw an error when str is an array", () => {
+  const str = ["a", "b", "c"];
+  const char = "a";
+  expect(() => countChar(str, char)).toThrow(errorMessageForString);
+});
+
+// test for str is a number
+test("should throw an error when str is a number", () => {
+  const str = 12345;
+  const char = "1";
+  expect(() => countChar(str, char)).toThrow(errorMessageForString);
+});
+
+// test for str is an object
+test("should throw an error when str is an object", () => {
+  const str = { a: 1, b: 2 };
+  const char = "a";
+  expect(() => countChar(str, char)).toThrow(errorMessageForString);
+});
+
+// test for str is null
+test("should throw an error when str is null", () => {
+  const str = null;
+  const char = "a";
+  expect(() => countChar(str, char)).toThrow(errorMessageForString);
+});
+
+// test for str is undefined
+test("should throw an error when str is undefined", () => {
+  const str = undefined;
+  const char = "a";
+  expect(() => countChar(str, char)).toThrow(errorMessageForString);
+});
+
+// test for str is a boolean
+test("should throw an error when str is a boolean", () => {
+  const str = true;
+  const char = "a";
+  expect(() => countChar(str, char)).toThrow(errorMessageForString);
+});
+
+// tests for unhappy paths (invalid char)
+const errorMessageForCharacter = "Input char should be a string";
+
+// test for char is an array
+test("should throw an error when char is an array", () => {
+  const str = "abcdefg";
+  const char = ["a", "b"];
+  expect(() => countChar(str, char)).toThrow(errorMessageForCharacter);
+});
+
+// test for char is a number
+test("should throw an error when char is a number", () => {
+  const str = "abcdefg";
+  const char = 1;
+  expect(() => countChar(str, char)).toThrow(errorMessageForCharacter);
+});
+
+// test for char is an object
+test("should throw an error when char is an object", () => {
+  const str = "abcdefg";
+  const char = { a: 1 };
+  expect(() => countChar(str, char)).toThrow(errorMessageForCharacter);
+});
+
+// test for char is null
+test("should throw an error when char is null", () => {
+  const str = "abcdefg";
+  const char = null;
+  expect(() => countChar(str, char)).toThrow(errorMessageForCharacter);
+});
+
+// test for char is undefined
+test("should throw an error when char is undefined", () => {
+  const str = "abcdefg";
+  const char = undefined;
+  expect(() => countChar(str, char)).toThrow(errorMessageForCharacter);
+});
+
+// test for char is a boolean
+test("should throw an error when char is a boolean", () => {
+  const str = "abcdefg";
+  const char = true;
+  expect(() => countChar(str, char)).toThrow(errorMessageForCharacter);
+});
+
+// test for char is more than one character
+const errorMessageForSingleCharacter =
+  "Input char should be a single character";
+
+test("should throw an error when char is more than one character", () => {
+  const str = "abcdefg";
+  const char = "ab";
+  expect(() => countChar(str, char)).toThrow(errorMessageForSingleCharacter);
+});
+
+// test for char is a space character
+test("should return 0 when char is a space character", () => {
+  const str = "abcdefg";
+  const char = " ";
+  const count = countChar(str, char);
+  expect(parseInt(count)).toEqual(0);
+});
+
+// test for str is a space character
+test("should return 0 when str is a space character", () => {
+  const str = "       ";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(parseInt(count)).toEqual(0);
+});
+
+//test for char is an empty string
+test("should throw an error when char is an empty string", () => {
+  const str = "abcdefg";
+  const char = "";
+  expect(() => countChar(str, char)).toThrow(errorMessageForSingleCharacter);
+});

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 +1,11 @@
-function repeat() {
-  return "hellohellohello";
+function repeat(str, count) {
+  if (typeof str !== "string") {
+    throw new Error("Input str should be a string in format 'Hello'");
+  }
+  if (!Number.isInteger(count) || count <= 0) {
+    throw new Error("Count should be a positive integer number");
+  }
+  return str.repeat(count);
 }
 
 module.exports = repeat;