London | 26-ITP-Sep | Maharit Belai | Sprint 2| Practice TDD

practice-tdd/count.js

@@ -1,3 +1,12 @@
 export function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  let count = 0;
+  if (findCharacter.length != 1) {
+    throw new Error(`Invalid Input,only character is allowed`);
+  }
+  for (let i = 0; i < stringOfCharacters.length; i++) {
+    if (stringOfCharacters[i] == findCharacter[0]) {
+      count = count + 1;
+    }
+  }
+  return count;
 }

practice-tdd/count.test.js

@@ -1,24 +1,74 @@
 // implement a function countChar that counts the number of times a character occurs in a string
 import { countChar } from "./count.js";
-// Given a string `str` and a single character `char` to search for,
-// When the countChar function is called with these inputs,
-// Then it should:
 
 // Scenario: Multiple Occurrences
-// Given the input string `str`,
-// And a character `char` that occurs one or more times in `str` (e.g., 'a' in 'aaaaa'),
-// When the function is called with these inputs,
-// Then it should correctly count occurrences of `char`.
 
-test("should count multiple occurrences of a character", () => {
+test("should count multiple occurrences of a character 'a' ", () => {
   const str = "aaaaa";
   const char = "a";
   const count = countChar(str, char);
   expect(count).toEqual(5);
 });
 
 // Scenario: No Occurrences
-// Given the input string `str`,
-// 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 count 0", () => {
+  const str = "aaaaa";
+  const char = "c";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+
+test("should count a character with strings of different characters", () => {
+  const str = "acc";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(1);
+});
+test("should count a character with strings of different characters that includes uppercase", () => {
+  const str = "AAAa";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(1);
+});
+test("should count multiple occurences of character when given with numbers", () => {
+  const str = "11aa";
+  const char = "1";
+  const count = countChar(str, char);
+  expect(count).toEqual(2);
+});
+test("should count multiple occurences of character with signs", () => {
+  const str = "£100";
+  const char = "£";
+  const count = countChar(str, char);
+  expect(count).toEqual(1);
+});
+test("should count multiple occurences of character empty space", () => {
+  const str = "let's play tag";
+  const char = " ";
+  const count = countChar(str, char);
+  expect(count).toEqual(2);
+});
+test("should count multiple occurences of character in a sentence", () => {
+  const str = "let's play tag";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(2);
+});
+test("should count multiple occurences of character in an empty string", () => {
+  const str = "";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+test("should count multiple occurences of character in a sentence", () => {
+  const str = " ";
+  const char = " ";
+  const count = countChar(str, char);
+  expect(count).toEqual(1);
+});
+test("should throw an error when findCharacter receives more than one character", () => {
+  expect(() => {
+    countChar("aaaaaaanaaa", "an");
+  }).toThrow(`Invalid Input,only character is allowed`);
+});

practice-tdd/get-ordinal-number.js

@@ -1,3 +1,19 @@
 export function getOrdinalNumber(num) {
-  return "1st";
+  let numStr = num.toString();
+  if (num <= 0 || num == " " || numStr.includes(".")) {
+    throw new Error("Invalid Input");
+  }
+
+  if (numStr.slice(-1) == "1" && numStr.slice(-2) != 11) {
+    return `${num}st`;
+  }
+
+  if (numStr.slice(-1) == "2" && numStr.slice(-2) != 12) {
+    return `${num}nd`;
+  }
+  if (numStr.slice(-1) == "3" && numStr.slice(-2) != 13) {
+    return `${num}rd`;
+  }
+
+  return `${num}th`;
 }

practice-tdd/get-ordinal-number.test.js

@@ -1,9 +1,8 @@
 import { getOrdinalNumber } from "./get-ordinal-number.js";
-// In this week's prep, we started implementing getOrdinalNumber.
 
+// In this week's prep, we started implementing getOrdinalNumber.
 // Continue testing and implementing getOrdinalNumber for additional cases.
 // Write your tests using Jest — remember to run your tests often for continual feedback.
-
 // To ensure thorough testing, we need broad scenarios that cover all possible cases.
 // Listing individual values, however, can quickly lead to an unmanageable number of test cases.
 // Instead of writing tests for individual numbers, consider grouping all possible input values
@@ -13,8 +12,59 @@ import { getOrdinalNumber } from "./get-ordinal-number.js";
 // Case 1: Numbers ending with 1 (but not 11)
 // When the number ends with 1, except those ending with 11,
 // Then the function should return a string by appending "st" to the number.
+
+// Case 1: Numbers ending with 1 (but not 11).
 test("should append 'st' for numbers ending with 1, except those ending with 11", () => {
   expect(getOrdinalNumber(1)).toEqual("1st");
   expect(getOrdinalNumber(21)).toEqual("21st");
   expect(getOrdinalNumber(131)).toEqual("131st");
 });
+
+// Case 2: Numbers ending with 2(but not 12).
+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(132)).toEqual("132nd");
+});
+//Case 3: Number ending with 3(but not 13)
+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(103)).toEqual("103rd");
+  expect(getOrdinalNumber(133)).toEqual("133rd");
+});
+//case 4 : Number ending 4,5,6,7,8,9 and 0.
+test("should append 'th' for numbers ending with (4,5,6,7,8,9,0)", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(10)).toEqual("10th");
+  expect(getOrdinalNumber(15)).toEqual("15th");
+  expect(getOrdinalNumber(58)).toEqual("58th");
+  expect(getOrdinalNumber(100)).toEqual("100th");
+});
+//Case 5: the exception numbers left out in all the cases(11,12,13)
+test("should append 'th' for numbers 11, 12, 13", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+  expect(getOrdinalNumber(111)).toEqual("111th");
+  expect(getOrdinalNumber(112)).toEqual("112th");
+  expect(getOrdinalNumber(113)).toEqual("113th");
+});
+
+//case 6 now we have come to the last one 0
+test(` should throw an error when num is 0`, () => {
+  expect(() => getOrdinalNumber(0)).toThrow(`Invalid Input`);
+});
+
+//case 7 how about when empty string is the argument
+test(`Should throw an error when num is empty string`, () => {
+  expect(() => getOrdinalNumber(" ")).toThrow(`Invalid Input`);
+});
+// Case 8 how about when num is -ve number
+test(`should throw an Error when num is -ve number`, () => {
+  expect(() => getOrdinalNumber(-5).toThrow(`Invalid Input`));
+});
+//case 9 when num is decimal number
+test(`Should throw an Error when num is decimal number`, () => {
+  expect(() => getOrdinalNumber(1.5).toThrow(`Invalid Input`));
+});

practice-tdd/repeat-str.js

@@ -1,5 +1,23 @@
-export function repeatStr() {
-  // Your implementation of this function must *not* call String.prototype.repeat (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat).
+export function repeatStr(str, count) {
+  // Your implementation of this function must *not* call String.prototype.repeat
+  //  (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat).
   // The goal is to re-implement that function, not to use it.
-  return "hellohellohello";
+
+  let repeatedStr = str;
+  count = Math.floor(count);
+
+  if (str === " ") {
+    throw new Error("String shoild not be empty");
+  }
+  if (count < 0) {
+    throw new Error("Negative counts are not valid");
+  }
+  if (count == 0) {
+    return "";
+  }
+
+  for (let i = 1; i < count; i++) {
+    repeatedStr += str;
+  }
+  return repeatedStr;
 }

practice-tdd/repeat-str.test.js

@@ -9,24 +9,52 @@ import { repeatStr } from "./repeat-str.js";
 // When the repeatStr function is called with these inputs,
 // Then it should return a string that contains the original `str` repeated `count` times.
 
-test("should repeat the string count times", () => {
+// Case: handle count of 1, 2, 3, 4:
+test("should repeat the string 1 times", () => {
+  const str = "hello";
+  const count = 1;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("hello");
+});
+test("should repeat the string 2 times", () => {
+  const str = "hello";
+  const count = 2;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("hellohello");
+});
+test("should repeat the string 3 times", () => {
   const str = "hello";
   const count = 3;
   const repeatedStr = repeatStr(str, count);
   expect(repeatedStr).toEqual("hellohellohello");
 });
-
-// Case: handle count of 1:
-// Given a target string `str` and a `count` equal to 1,
-// When the repeatStr function is called with these inputs,
-// Then it should return the original `str` without repetition.
-
+test("should repeat the string 4 times", () => {
+  const str = "hello";
+  const count = 4;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("hellohellohellohello");
+});
 // 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 repeat the string 0 times", () => {
+  const str = "hello";
+  const count = 0;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("");
+});
+//case: Handle decimal count:
+test("should repeat the stringthe whole number in the count times", () => {
+  const str = "hello";
+  const count = 2.5;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("hellohello");
+});
 // 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.
+// Then it should throw an error, as negative counts are not valid
+test("should throw an error when -1 count is given", () => {
+  expect(() => repeatStr("hello", -1)).toThrow("Negative counts are not valid");
+});
+test(`should throw an error when string is empty`, () => {
+  expect(() => repeatStr(" ", 1)).toThrow("String shoild not be empty");
+});