Implement practice TDD exercises

Author: marthak1

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

@@ -1,5 +1,15 @@
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  let count = 0;
+  const str = stringOfCharacters.length;
+
+  for (let i = 0; i < str; i++) {
+    if (stringOfCharacters[i] === findCharacter) {
+      count += 1;
+      console.log(stringOfCharacters[i]);
+    }
+  }
+  return count;
 }
+console.log(countChar("little", "t"));
 
 module.exports = countChar;

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

@@ -22,3 +22,10 @@ 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("no occurrences of character in string", () => {
+  const str = "little"
+  const char = "b"
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});

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

@@ -1,5 +1,23 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  const lastTwoDigits = num % 100;
+  const lastDigit = num % 10;
+
+  if (lastTwoDigits >= 11 && lastTwoDigits <= 13) {
+    return `${num}${"th"}`;
+  }
+
+  switch (lastDigit) {
+    case 1:
+      return `${num}${"st"}`;
+    case 2:
+      return `${num}${"nd"}`;
+    case 3:
+      return `${num}${"rd"}`;
+    default:
+      return `${num}${"th"}`;
+  }
 }
 
+console.log(getOrdinalNumber(3));
+
 module.exports = getOrdinalNumber;

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

@@ -18,3 +18,29 @@ test("should append 'st' for numbers ending with 1, except those ending with 11"
   expect(getOrdinalNumber(21)).toEqual("21st");
   expect(getOrdinalNumber(131)).toEqual("131st");
 });
+
+// Case 2: Numbers ending in 2 → add nd → (2nd, 22nd, 42nd)
+test("should append 'nd' for numbers ending with 2", () => {
+  expect(getOrdinalNumber(2)).toEqual("2nd");
+  expect(getOrdinalNumber(22)).toEqual("22nd");
+  expect(getOrdinalNumber(142)).toEqual("142nd");
+});
+// Case 3: Numbers ending in 3 → add rd → (3rd, 23rd, 53rd)
+test("should append '3rd' for numbers ending with 3", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+  expect(getOrdinalNumber(33)).toEqual("33rd");
+  expect(getOrdinalNumber(153)).toEqual("153rd");
+});
+// Case 4: All other numbers → add th → (4th, 6th, 20th, 100th)
+test("should append 'th' for numbers ending with 4", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(20)).toEqual("20th");
+  expect(getOrdinalNumber(100)).toEqual("100th");
+});
+// Exceptions: Numbers ending in 11, 12, and 13 use -th (e.g., 11th, 12th, 13th). 
+test("should append 'th' for numbers ending with 11, 12 and 13", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(113)).toEqual("113th");
+});
+

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

@@ -1,5 +1,8 @@
-function repeatStr() {
-  return "hellohellohello";
+function repeatStr(str, count) {
+  if(count < 0){
+    throw new Error("negative counts are not valid");
+  }
+  return str.repeat(count);
 }
 
 module.exports = repeatStr;

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

@@ -20,13 +20,28 @@ test("should repeat the string count times", () => {
 // 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 throw an error`, () => {
+  expect(() => {
+    repeatStr("hello", -1);
+  }).toThrow();
+});