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

@@ -1,19 +1,29 @@
 // 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("counts multiple occurrences of a character", () => {
+    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);
+  const Char = "a";
+  const count = countChar(str,Char);
   expect(count).toEqual(5);
 });
 
@@ -22,3 +32,11 @@ test("should count multiple occurrences of a character", () => {
 // 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 +1,21 @@
 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

@@ -11,3 +11,13 @@ const getOrdinalNumber = require("./get-ordinal-number");
 test("should return '1st' for 1", () => {
   expect(getOrdinalNumber(1)).toEqual("1st");
 });
+test("should return 'th' for 11, 12, 13", () => {
+  expect(getOrdinalNumber(11)).toBe("11th");
+  expect(getOrdinalNumber(12)).toBe("12th");
+  expect(getOrdinalNumber(13)).toBe("13th");
+});
+test("should return correct ordinal for numbers > 20", () => {
+  expect(getOrdinalNumber(21)).toBe("21st");
+  expect(getOrdinalNumber(22)).toBe("22nd");
+  expect(getOrdinalNumber(23)).toBe("23rd");    
+});

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");
+});