London | 26-ITP-May | Chun Yan Wong | Sprint 3 | practice-TDD

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

@@ -1,5 +1,12 @@
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+    let count = 0;
+    let char = "";
+    for (let char of stringOfCharacters) {
+        if (char === findCharacter) {
+            count++;
+        }
+    }
+    return count;
 }
 
 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 for an empty string", () => {
+    const str = "";
+    const char = "a";
+    const count = countChar(str, char);
+    expect(count).toEqual(0);
+});

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

@@ -1,5 +1,17 @@
 function getOrdinalNumber(num) {
-  return "1st";
+    const lastTwoDigits = num % 100;
+
+    // Handle special cases: 11th, 12th, 13th
+    if (lastTwoDigits >= 11 && lastTwoDigits <= 13) {
+        return `${num}th`;
+    }
+
+    // Normal rules
+    if (lastDigit === 1) return `${num}st`;
+    if (lastDigit === 2) return `${num}nd`;
+    if (lastDigit === 3) return `${num}rd`;
+
+    return `${num}th`;
 }
 
 module.exports = getOrdinalNumber;

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

@@ -18,3 +18,28 @@ test("should append 'st' for numbers ending with 1, except those ending with 11"
   expect(getOrdinalNumber(21)).toEqual("21st");
   expect(getOrdinalNumber(131)).toEqual("131st");
 });
+
+test("handles numbers ending in 2 (nd)", () => {
+    expect(getOrdinalNumber(2)).toEqual("2nd");
+    expect(getOrdinalNumber(22)).toEqual("22nd");
+    expect(getOrdinalNumber(102)).toEqual("102nd");
+});
+
+test("handles numbers ending in 3 (rd)", () => {
+    expect(getOrdinalNumber(3)).toEqual("3rd");
+    expect(getOrdinalNumber(23)).toEqual("23rd");
+    expect(getOrdinalNumber(103)).toEqual("103rd");
+});
+
+test("handles numbers ending in 11, 12, 13 (th exceptions)", () => {
+    expect(getOrdinalNumber(11)).toEqual("11th");
+    expect(getOrdinalNumber(12)).toEqual("12th");
+    expect(getOrdinalNumber(13)).toEqual("13th");
+    expect(getOrdinalNumber(111)).toEqual("111th");
+});
+
+test("handles general th cases", () => {
+    expect(getOrdinalNumber(4)).toEqual("4th");
+    expect(getOrdinalNumber(20)).toEqual("20th");
+    expect(getOrdinalNumber(100)).toEqual("100th");
+});

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

@@ -1,7 +1,18 @@
-function repeatStr() {
+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 result = "";
+
+    for (let i = 0; i < count; i++) {
+        result += str;
+    }
+
+    if (count >= 0) {
+        return result;
+    }
+    else {
+        throw new Error("Count cannot be negative");
+    }
 }
 
 module.exports = repeatStr;

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

@@ -16,6 +16,23 @@ test("should repeat the string count times", () => {
   expect(repeatedStr).toEqual("hellohellohello");
 });
 
+// Case: handle count of 1
+test("should repeat the string 1 time", () => {
+    const result = repeatStr("hello", 1);
+    expect(result).toEqual("hello");
+});
+
+// Case: handle count of 0
+test("should return an empty string when count is 0", () => {
+    const result = repeatStr("hello", 0);
+    expect(result).toEqual("");
+});
+
+// Case: handle negative count
+test("should throw an error when count is negative", () => {
+    expect(() => repeatStr("hello", -3)).toThrow();
+});
+
 // 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,