London | 25-ITP-September |Sophia Mohamed |Sprint 3 | 2 practice tdd

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

@@ -1,5 +1,12 @@
-function countChar(stringOfCharacters, findCharacter) {
-  return 5
-}
+function countChar(str, char) {
+  let count = 0;
+
+  for (let i = 0; i < str.length; i++) {//loop through each character in the string
+    if (str[i] === char) {//check if the character matches the target character
+      count = count + 1;
+    }
+  }
 
-module.exports = countChar;
+  return count;//return the final count
+}
+module.exports = countChar;

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

@@ -1,24 +1,43 @@
 // implement a function countChar that counts the number of times a character occurs in a string
 const countChar = require("./count");
+
+
 // Given a string str and a single character char to search for,
 // When the countChar function is called with these inputs,
-// Then it should:
+// Scenario: Single Occurrence
 
+test("counts a single occurrence of a character", () => {
+    expect(countChar("hello", "h")).toEqual(1);
+    expect(countChar("world", "d")).toEqual(1);
+  });
 // Scenario: Multiple Occurrences
 // Given the input string str,
 // And a character char that may occur multiple times with overlaps within str (e.g., 'a' in 'aaaaa'),
 // When the function is called with these inputs,
 // Then it should correctly count overlapping occurrences of char (e.g., 'a' appears five times in 'aaaaa').
-
-test("should count multiple occurrences of a character", () => {
-  const str = "aaaaa";
-  const char = "a";
-  const count = countChar(str, char);
-  expect(count).toEqual(5);
+test("counts multiple occurrences of a character", () => {
+  expect(countChar("aaaaa", "a")).toEqual(5);
+  expect(countChar("banana", "a")).toEqual(3);
+  expect(countChar("mississippi", "s")).toEqual(4);
 });
 
+//test("should count multiple occurrences of a character", () => {
+ // const str = "aaaaa";
+  //const Char = "a";
+  //const count = countChar(str,Char);
+ // expect(count).toEqual(5);
+//});
+
 // Scenario: No Occurrences
 // Given the input string str,
 // And a character char that does not exist within the case-sensitive str,
 // When the function is called with these inputs,
 // Then it should return 0, indicating that no occurrences of the char were found in the case-sensitive str.
+// Scenario: No Occurrences
+test("should return 0 if the character is not in the string", () => {
+  const str = "hello";
+  const char = "x"; // character not present in str
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+

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

@@ -1,5 +1,22 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  const lastTwoDigits = num % 100; // check the last 2 digits for 11,12,13
+  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";
+
+  }
 }
 
 module.exports = getOrdinalNumber;

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

@@ -1,13 +1,48 @@
 const getOrdinalNumber = require("./get-ordinal-number");
+
+
 // 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
 
-// Case 1: Identify the ordinal number for 1
-// When the number is 1,
-// Then the function should return "1st"
-
-test("should return '1st' for 1", () => {
+// Case 1: Numbers ending in 1 (but not 11)
+test("append 'st' to numbers ending in 1, except those ending in 11", () => {
   expect(getOrdinalNumber(1)).toEqual("1st");
+  expect(getOrdinalNumber(21)).toEqual("21st");
+  expect(getOrdinalNumber(101)).toEqual("101st");
+  expect(getOrdinalNumber(111)).toEqual("111th"); // exception
+});
+
+// Case 2: Numbers ending in 2 (but not 12)
+test("append 'nd' to numbers ending in 2, except those ending in 12", () => {
+  expect(getOrdinalNumber(2)).toEqual("2nd");
+  expect(getOrdinalNumber(22)).toEqual("22nd");
+  expect(getOrdinalNumber(102)).toEqual("102nd");
+  expect(getOrdinalNumber(112)).toEqual("112th"); // exception
 });
+// Case 3: Numbers ending in 3 (but not 13)
+test("append 'rd' to numbers ending in 3, except those ending in 13", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+  expect(getOrdinalNumber(23)).toEqual("23rd");
+  expect(getOrdinalNumber(103)).toEqual("103rd");
+  expect(getOrdinalNumber(113)).toEqual("113th"); // exception
+});
+// Case 4: Numbers ending in 4–9 or exceptions (11, 12, 13)
+test("append 'th' to numbers ending in 4–9 or ending with 11, 12, or 13", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(9)).toEqual("9th");
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+});
+  // Optional: edge cases
+  test("should handle 0 and large numbers correctly", () => {
+    expect(getOrdinalNumber(0)).toBe("0th");
+    expect(getOrdinalNumber(1000001)).toBe("1000001st"); // ends with 1, not teen
+    expect(getOrdinalNumber(1000012)).toBe("1000012th"); // ends with 12 -> teen
+
+  });
+
+
+

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

@@ -1,5 +1,8 @@
-function repeat() {
-  return "hellohellohello";
+function repeat(word, times) {
+  if (times < 0) {
+    throw new Error("Count must be a non-negative number");
+  }
+  return word.repeat(times);
 }
 
 module.exports = repeat;

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

@@ -20,13 +20,23 @@ test("should repeat the string count times", () => {
 // Given a target string str and a count equal to 1,
 // When the repeat function is called with these inputs,
 // Then it should return the original str without repetition, ensuring that a count of 1 results in no repetition.
-
+test("should repeat the string count times", () => {
+const str = "hello";
+  const count = 1;
+  const repeatedStr = repeat(str, count);
+  expect(repeatedStr).toEqual("hello");   
+});
 // case: Handle Count of 0:
 // Given a target string str and a count equal to 0,
 // When the repeat function is called with these inputs,
 // Then it should return an empty string, ensuring that a count of 0 results in an empty output.
-
+test("should return empty string when times is 0", () => {
+  expect(repeat("hello", 0)).toEqual("");
+});
 // case: Negative Count:
 // Given a target string str and a negative integer count,
 // When the repeat function is called with these inputs,
 // Then it should throw an error or return an appropriate error message, as negative counts are not valid.
+test("should throw an error when count is negative", () => {
+  expect(() => repeat("hello", -3)).toThrow("Count must be a non-negative number");
+});