London | 26-ITP-Jan | Zadri Abdule | Sprint 3 | coursework practice tdd

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

@@ -1,5 +1,13 @@
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  let count = 0;
+  for (let i = 0; i < stringOfCharacters.length; i++) {
+    if (stringOfCharacters[i] === findCharacter) {
+      count++;
+    }
+  }
+
+  return count;
 }
 
+
 module.exports = countChar;

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

@@ -1,9 +1,11 @@
 // 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: Multiple Occurrences
 // Given the input string `str`,
 // And a character `char` that occurs one or more times in `str` (e.g., 'a' in 'aaaaa'),
@@ -22,3 +24,10 @@ 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 when the character is not present in the string", () => {
+  const str = "aaaaa";
+  const char = "b";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+
+});

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

@@ -1,5 +1,25 @@
+// - Input: any Number (finite or not). Non-finite values (NaN, Infinity) are stringified.
+// - Behaviour: uses the ingteger part (Math.trunc) so descimals are truncated (e.g. 4.9 -> 4).
+// - Negative numbers keep their sign (e.g. -3 -> '-3rd').
+// - Special case: 11, 12, 13 always use 'th.
+// - Output: a string like '1st', '2nd', '11th' 0r 'NaN'/'Infinity' for non-finite input.
+
+
+
 function getOrdinalNumber(num) {
-  return "1st";
+  if (!Number.isFinite(num)) return String(num);
+  const sign = num < 0 ? '-' : '';
+  const i = Math.trunc(Math.abs(num));
+  const lastTwo = i % 100;
+  if (lastTwo >= 11 && lastTwo <= 13) return sign + i + 'th';
+
+
+  switch (i % 10) {
+    case 1: return sign + i + 'st;
+    case 2: return sign + i + 'nd';
+    case 3: return sign + i + 'rd';
+    default: return sign + i + 'th';
+  }
 }
 
 module.exports = getOrdinalNumber;

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

@@ -17,4 +17,42 @@ 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)
+// 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(22)).toEqual("22nd");
+  expect(getOrdinalNumber(132)).toEqual("132nd");
+});
+
+// Case 3: Numbers ending with 3 (but not 13)
+// When the case ends with 3, expect 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(23)).toEqual("23rd");
+  expect(getOrdinalNumber(133)).toEqual("133rd");
+});
+
+// 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 ending with 11, 12, or 13", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+});
+
+// Case 5: ALL other numbers
+// When the number does not end with 1, 2, 3, 11, 12, or 13,
+// Then the function should return a string by appending "th" to the number.
+test("should append 'th' for all other numbers", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(10)).toEqual("10th");
+  expect(getOrdinalNumber(14)).toEqual("14th");
+  expect(getOrdinalNumber(100)).toEqual("100th");
 });