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

practice-tdd/count.js

@@ -1,3 +1,9 @@
 export function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  let count = 0;
+  for (let i = 0; i < stringOfCharacters.length; i++) {
+    if (stringOfCharacters[i] == findCharacter[0]) {
+      count = count + 1;
+    }
+  }
+  return count;
 }

practice-tdd/count.test.js

@@ -1,14 +1,7 @@
 // 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", () => {
   const str = "aaaaa";
@@ -18,7 +11,47 @@ test("should count multiple occurrences of a character", () => {
 });
 
 // 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 multiple occurences of character", () => {
+  const str = "aaaaa";
+  const char = "c";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+
+test("should count multiple occurences of character", () => {
+  const str = "acc";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(1);
+});
+test("should count multiple occurences of character", () => {
+  const str = "AAAa";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(1);
+});
+test("should count multiple occurences of character", () => {
+  const str = "11aa";
+  const char = "1";
+  const count = countChar(str, char);
+  expect(count).toEqual(2);
+});
+test("should count multiple occurences of character", () => {
+  const str = "£100";
+  const char = "£";
+  const count = countChar(str, char);
+  expect(count).toEqual(1);
+});
+test("should count multiple occurences of character", () => {
+  const str = "let's play tag";
+  const char = " ";
+  const count = countChar(str, char);
+  expect(count).toEqual(2);
+});
+test("should count multiple occurences of character", () => {
+  const str = "let's play tag";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(2);
+});

practice-tdd/get-ordinal-number.js

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

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

@@ -1,20 +1,39 @@
 import { getOrdinalNumber } from "./get-ordinal-number.js";
-// 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
-// into meaningful categories. Then, select representative samples from each category to test.
-// This approach improves coverage and makes our tests easier to maintain.
 
 // 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.
+.
 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 1, except those ending with 11", () => {
+  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 1, except those ending with 11", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+  expect(getOrdinalNumber(23)).toEqual("23rd");
+  expect(getOrdinalNumber(133)).toEqual("133rd");
+});
+//case 4 : Number ending between 4 and 9 including (0,4,9)
+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");
+});
+//case 5 now we have come to the last one 0
+test(` should throw an error when num is 0`, () => {
+  expect(() => getOrdinalNumber(0)).toThrow(`Invalid Input`);
+});

practice-tdd/repeat-str.js

@@ -1,5 +1,13 @@
-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).
-  // The goal is to re-implement that function, not to use it.
-  return "hellohellohello";
+export function repeatStr(str, count) {
+  let repeatedStr = str;
+  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

@@ -1,32 +1,43 @@
 // Implement a function repeatStr
 import { repeatStr } from "./repeat-str.js";
-// Given a target string `str` and a positive integer `count`,
-// When the repeatStr function is called with these inputs,
-// Then it should:
-
-// Case: handle multiple repetitions:
-// Given a target string `str` and a positive integer `count` greater than 1,
-// 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", () => {
   const str = "hello";
   const count = 3;
   const repeatedStr = repeatStr(str, count);
   expect(repeatedStr).toEqual("hellohellohello");
 });
+test("should repeat the string count times", () => {
+  const str = "hello";
+  const count = 2;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("hellohello");
+});
+test("should repeat the string count times", () => {
+  const str = "hello";
+  const count = 4;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("hellohellohellohello");
+});
 
 // 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 count times", () => {
+  const str = "hello";
+  const count = 1;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("hello");
+});
 // 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 count times", () => {
+  const str = "hello";
+  const count = 0;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual(" ");
+});
 // 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.
+
+test("should repeat the string count times", () => {
+  expect(() => repeatStr("hello", -1)).toThrow("Negative counts are not valid");
+});