London | ITP-Jan-26 | Mohsen Zamani | Sprint 3 | practice tdd

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

@@ -1,5 +1,8 @@
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  return [...stringOfCharacters].reduce(
+    (acc, curr) => acc + (curr === findCharacter ? 1 : 0),
+    0
+  );
 }
 
 module.exports = countChar;

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

@@ -22,3 +22,9 @@ 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 return 0, since there are no occurrences of a character", () => {
+  const char = "a";
+  const str = "AABBFFSAA";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});

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

@@ -1,5 +1,24 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  const last2Digits = String(num).slice(-2);
+  if (["11", "12", "13"].includes(last2Digits)) return `${num}th`;
+
+  const lastDigit = String(num).slice(-1);
+  const restOfNum = String(num).slice(0, -1);
+  let ordinalResult = "";
+  switch (lastDigit) {
+    case "1":
+      ordinalResult = `${num}st`;
+      break;
+    case "2":
+      ordinalResult = `${num}nd`;
+      break;
+    case "3":
+      ordinalResult = `${num}rd`;
+      break;
+    default:
+      ordinalResult = `${num}th`;
+  }
+  return ordinalResult;
 }
 
 module.exports = getOrdinalNumber;

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

@@ -18,3 +18,41 @@ 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 with 2 (but not 12)
+// When the number ends with 2, except those ending with 12,
+// Then the function should return a string by appending "nd" to the number.
+test("should append 'nd' for numbers ending with 2, except those ending with 12", () => {
+  expect(getOrdinalNumber(2)).toEqual("2nd");
+  expect(getOrdinalNumber(31562)).toEqual("31562nd");
+  expect(getOrdinalNumber(2322)).toEqual("2322nd");
+});
+
+// Case 3: Numbers ending with 3 (but not 13)
+// When the number ends with 3, except those ending with 13,
+// Then the function should return a string by appending "rd" to the number.
+test("should append 'rd' for numbers ending with 3, except those ending with 13", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+  expect(getOrdinalNumber(3243)).toEqual("3243rd");
+  expect(getOrdinalNumber(5462133)).toEqual("5462133rd");
+});
+
+// Case 4: Numbers ending with 11, 12 or 13
+// When the number ends with 11, 12 or 13
+// Then the function should return a string by appending "th" to the number.
+test("should append 'th' for numbers with 11, 12 or 13", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(2111)).toEqual("2111th");
+  expect(getOrdinalNumber(2113)).toEqual("2113th");
+  expect(getOrdinalNumber(524312)).toEqual("524312th");
+});
+
+// Case 4: Numbers not ending in 1, 2 and 3
+// When the number ends with 0, 4, 5, 6, 7, 8, 9
+// Then the function should return a string by appending "th" to the number.
+test("should append 'th' for numbers not ending in 1, 2 and 3", () => {
+  expect(getOrdinalNumber(19)).toEqual("19th");
+  expect(getOrdinalNumber(2118)).toEqual("2118th");
+  expect(getOrdinalNumber(2110)).toEqual("2110th");
+  expect(getOrdinalNumber(524334)).toEqual("524334th");
+});

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

@@ -1,5 +1,6 @@
-function repeatStr() {
-  return "hellohellohello";
+function repeatStr(str, count) {
+  if (count < 0) throw new Error("Can not repeat negative times.");
+  return str.repeat(count);
 }
 
 module.exports = repeatStr;

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

@@ -20,13 +20,30 @@ 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 repeat the string count times", () => {
+  const str = "hello";
+  const count = -3;
+  expect(() => repeatStr(str, count)).toThrow("Can not repeat negative times.");
+});