London | 26-May-ITP | Yonatan Teklemariam | Sprint 3 | Practice-tdd

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

@@ -1,5 +1,21 @@
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  if (
+    typeof stringOfCharacters !== "string" ||
+    typeof findCharacter !== "string"
+  ) {
+    return 0;
+  }
+  let count = 0;
+  for (let i = 0; i < stringOfCharacters.length; i++) {
+    if (stringOfCharacters[i] === findCharacter) {
+      count++;
+    }
+  }
+  return count;
 }
-
+console.log(countChar("aaaaa", "a")); // should return 5
+console.log(countChar("bravo", "u")); // should return 0
+console.log(countChar("", "a")); // should return 0
+console.log(countChar("1-2-3-4-5-", "-")); // should return 5
+console.log(countChar("AaAa", "A")); // should return 2
 module.exports = countChar;

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

@@ -18,6 +18,25 @@ test("should count multiple occurrences of a character", () => {
 });
 
 // Scenario: No Occurrences
+test(`should return zero the character doesn't exist in the string`, () => {
+  const str = "bravo";
+  const char = "u";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+
+// Empty String
+test(`should return zero when the string is empty`, () => {
+  expect(countChar("", "a")).toEqual(0);
+});
+
+// Scenario: Multiple Occurrences
+test("should count multiple occurrences of characters (including mixed and case-sensitive)", () => {
+  expect(countChar("aaaaa", "a")).toEqual(5); // simple multiple
+  expect(countChar("1-2-3-4-5-", "-")).toEqual(5); // mixed characters
+  expect(countChar("AaAa", "A")).toEqual(2); // case sensitivity
+});
+
 // Given the input string `str`,
 // And a character `char` that does not exist within `str`.
 // When the function is called with these inputs,

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

@@ -1,5 +1,22 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  if (typeof num !== "number" || !Number.isInteger(num) || num < 0) {
+    throw new Error("Input must be a non-negative integer");
+  }
+
+  const lastTwo = num % 100;
+  const lastDigit = num % 10;
+
+  // Special cases: 11th, 12th, 13th
+  if (lastTwo === 11 || lastTwo === 12 || lastTwo === 13) {
+    return `${num}th`;
+  }
+
+  // Normal cases
+  if (lastDigit === 1) return `${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

@@ -13,8 +13,37 @@ const getOrdinalNumber = require("./get-ordinal-number");
 // 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 2, except those ending with 12", () => {
+  expect(getOrdinalNumber(2)).toEqual("2nd");
+  expect(getOrdinalNumber(22)).toEqual("22nd");
+  expect(getOrdinalNumber(102)).toEqual("102nd");
+});
+
+// Case 3: Numbers ending with 3 (but NOT 13)
+test("should append 'rd' for numbers ending with 3, except those ending with 13", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+  expect(getOrdinalNumber(33)).toEqual("33rd");
+  expect(getOrdinalNumber(103)).toEqual("103rd");
+});
+
+// Case 4: Numbers ending with 11, 12, or 13 --- 11,12,13,111,121,131,
+test("should append 'th' for numbers ending with 11, 12, 13", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+});
+
+// Case 5: Numbers ending with larger numbers of 111, 121, 131
+test("should append 'th' for numbers ending with 111, 112, 113", () => {
+  expect(getOrdinalNumber(111)).toEqual("111th");
+  expect(getOrdinalNumber(112)).toEqual("112th");
+  expect(getOrdinalNumber(113)).toEqual("113th");
+});

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

@@ -1,7 +1,28 @@
-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";
+// 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.
+function repeatStr(str, count) {
+  if (typeof str !== "string") {
+    return "";
+  }
+  if (count < 0) {
+    throw new Error("Invalid input: count must be a non-negative integer");
+  }
+
+  let result = "";
+
+  for (let i = 0; i < count; i++) {
+    result += str;
+  }
+
+  return result;
 }
+console.log(repeatStr("hello", 3)); // Output: "hellohellohello"
+console.log(repeatStr("fella", 1)); // Output: "fella"
+console.log(repeatStr("fella", 0)); // Output: ""
+console.log(repeatStr("ab", 3)); // Output: "ababab"
+console.log(repeatStr("a", 1000).length); // Output: 1000
+console.log(repeatStr("", 5)); // Output: ""
+console.log(repeatStr([], 3)); // Output: ""
+console.log(repeatStr(null, 3)); // Output: ""
 
 module.exports = repeatStr;

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

@@ -17,16 +17,48 @@ test("should repeat the string count times", () => {
 });
 
 // Case: handle count of 1:
+test("should repeat the string count of 1", () => {
+  const str = "fella";
+  const count = 1;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("fella");
+});
+
 // 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.
 
 // Case: Handle count of 0:
+test("should repeat the string count of 0", () => {
+  const str = "fella";
+  const count = 0;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("");
+});
+
 // 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.
 
 // Case: Handle negative count:
+test(`should throw an error for negative count`, () => {
+  expect(() => repeatStr("fella", -2)).toThrowError(
+    "Invalid input: count must be a non-negative integer"
+  );
+});
 // 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 return empty string for non-string input", () => {
+  expect(repeatStr([], 3)).toEqual("");
+  expect(repeatStr(null, 3)).toEqual("");
+});
+test("should handle large repeat counts", () => {
+  expect(repeatStr("a", 1000).length).toEqual(1000);
+});
+test("should repeat a multi-character string multiple times", () => {
+  expect(repeatStr("ab", 3)).toEqual("ababab");
+});
+test("should return an empty string when repeating an empty string", () => {
+  expect(repeatStr("", 5)).toEqual("");
+});