London|26-ITP-Sep|Abdennour Hachemi|Sprint 2 |Practice TDD

practice-tdd/count.js

@@ -1,3 +1,9 @@
 export function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  let count = 0;
+  for (const character of stringOfCharacters) {
+    if (character === findCharacter) {
+      count++;
+    }
+  }
+  return count;
 }

practice-tdd/count.test.js

@@ -1,5 +1,6 @@
 // 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:
@@ -22,3 +23,10 @@ test("should count multiple occurrences of a character", () => {
 // 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 indicate no occurrences of a character", () => {
+  const str = "abcde";
+  const char = "f";
+  const numberOfOccurrence = countChar(str, char);
+  expect(numberOfOccurrence).toEqual(0);
+});

practice-tdd/get-ordinal-number.js

@@ -1,3 +1,21 @@
 export function getOrdinalNumber(num) {
-  return "1st";
+  //handle a non number inputs
+  if (!num) {
+    return "";
+  }
+  const lastTwoDigits = num % 100;
+  // Handle exceptions: 11th, 12th, 13th, 111th, etc.
+  if (lastTwoDigits >= 11 && lastTwoDigits <= 13) {
+    return `${num}th`;
+  }
+  switch (num % 10) {
+    case 1:
+      return `${num}st`;
+    case 2:
+      return `${num}nd`;
+    case 3:
+      return `${num}rd`;
+    default:
+      return `${num}th`;
+  }
 }

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

@@ -1,20 +1,66 @@
 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
 // 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.
+// Case 1:
 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:
+test("should append 'nd' for numbers ending with 2, except those ending with 12", () => {
+  expect(getOrdinalNumber(2)).toEqual("2nd");
+  expect(getOrdinalNumber(32)).toEqual("32nd");
+  expect(getOrdinalNumber(72)).toEqual("72nd");
+  expect(getOrdinalNumber(452)).toEqual("452nd");
+  expect(getOrdinalNumber(862)).toEqual("862nd");
+});
+
+// Case 3: N
+test("should append 'rd' for numbers ending with 3, except those ending with 13", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+  expect(getOrdinalNumber(43)).toEqual("43rd");
+  expect(getOrdinalNumber(93)).toEqual("93rd");
+  expect(getOrdinalNumber(823)).toEqual("823rd");
+  expect(getOrdinalNumber(183)).toEqual("183rd");
+});
+
+// Case 4:
+test("should append 'th' for numbers ending with 4,5,6 ,7 ,8 or 9 ", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(25)).toEqual("25th");
+  expect(getOrdinalNumber(656)).toEqual("656th");
+  expect(getOrdinalNumber(1007)).toEqual("1007th");
+  expect(getOrdinalNumber(638398)).toEqual("638398th");
+  expect(getOrdinalNumber(34454559)).toEqual("34454559th");
+});
+
+// Case 5:
+test("should append 'th' for numbers in 100's ending with 11, 12 , 13", () => {
+  expect(getOrdinalNumber(111)).toEqual("111th");
+  expect(getOrdinalNumber(112)).toEqual("112th");
+  expect(getOrdinalNumber(113)).toEqual("113th");
+});
+
+// Case 6:A test case handling the special cases like 11,12,13,101 & 103
+
+test("should append 'th' for numbers for 11,12,13 and 'st' for 101 and 'rd' for 103", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+  expect(getOrdinalNumber(101)).toEqual("101st");
+  expect(getOrdinalNumber(103)).toEqual("103rd");
+});
+
+test("should return empty string if empty string is passed", () => {
+  expect(getOrdinalNumber("")).toEqual("");
+});

practice-tdd/repeat-str.js

@@ -1,5 +1,14 @@
-export function repeatStr() {
+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";
+  if (count < 0) {
+    throw new Error("Error! negative counts are not valid");
+  }
+  let result = "";
+  let counter = count;
+  while (counter > 0) {
+    result += str;
+    counter--;
+  }
+  return result;
 }

practice-tdd/repeat-str.test.js

@@ -9,7 +9,7 @@ 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", () => {
+test("should repeat the string  3 times when  the value of count =3", () => {
   const str = "hello";
   const count = 3;
   const repeatedStr = repeatStr(str, count);
@@ -21,12 +21,34 @@ test("should repeat the string count times", () => {
 // When the repeatStr function is called with these inputs,
 // Then it should return the original `str` without repetition.
 
+test("should return the original string when the count is 1", () => {
+  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 return an empty string when the count is 0", () => {
+  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 throw an error, when count is a negative number.", () => {
+  const str = "hello";
+  const count = -3;
+  expect(() => repeatStr(str, count)).toThrow(
+    "Error! negative counts are not valid"
+  );
+});